Filter base for electronic connection to mating filter housing assembly

ABSTRACT

A filter base for receiving a complementary mating filter housing assembly. The filter base includes a base platform having fluid ingress and egress stanchions, and a wire harness assembly including a connector housing integral with or connected to the base platform for establishing an electrical connection between the filter base and the filter housing assembly. The wire harness assembly includes conductors extending between first and second connectors, with one or more resilient contacts provided on the second connector. The connector housing has an upper surface and an oppositely facing lower surface and is dimensioned to receive a first end portion of the one or more contacts. The contacts are flexible from a first position to a second position when a mating portion of the one or more contacts engages a mating connection surface of the filter housing assembly. The mating connection surface may be a circuit pad of a printed circuit board, wherein the contact mating portions are configured to be positioned in mechanical and electrical engagement with the circuit pads when the filter housing assembly is received within the filter base.

BACKGROUND OF THE INVENTION 1. Field of the Invention

Embodiments of this invention relate to a filtering apparatus, specifically a filter housing apparatus to facilitate easy removal and replacement of a filter housing from a mechanical support, and to a push filter design that activates a floating key lock, where the key may be used simultaneously as a lock and as an identifier for particular filter attributes. The mechanical support may be situated inline, and in fluid communication, with influent and effluent piping, such as within a refrigerator. More specifically, the invention relates to a filter housing and mount, whereby the filter housing may be attached to, and removed from, the mount by a push-actuated release. A controlled attachment or detachment of the filter sump, containing the filter media, may be activated by the axial push of the sump towards the mechanical support. The specific key lock design allows a user to identify and match certain filter configurations received by the mechanical support, and reject other filter configurations. An internal shutoff, activated by the push-actuated release, may block spillage during filter housing removal and replacement. The mechanical support may include a filter base for establishing an electrical connection between the filter base and the filter housing apparatus that allows for electronic authentication of the filter housing assembly, or for analyzing other criteria associated with a filter cartridge, such as whether the filter media has reached the end of its useful life.

2. Description of Related Art

The invention relates to a water filtration system having a locking and unlocking mechanism for changing the filter when the filter media has served its useful life. The use of liquid filtration devices is well known in the art as shown in U.S. Pat. Nos. 5,135,645, 5,914,037 and 6,632,355. Although these patents show filters for water filtration, the filters are difficult to replace owing to their design and placement. For example, U.S. Pat. No. 5,135,645 discloses a filter cartridge as a plug-in cartridge with a series of switches to prevent the flow of water when the filter cartridge is removed for replacement. The filter must be manually inserted and removed and have a switch activated to activate valve mechanisms so as to prevent the flow of water when the filter is removed. The cover of the filter is placed in the sidewall of a refrigerator and is employed to activate the switches that activate the valves. The filter access is coplanar with the refrigerator wall and forces an awkward access to the filter cartridge.

In U.S. patent application Ser. No. 11/511,599 filed on Aug. 28, 2006, for Huda, entitled: “FILTER HOUSING APPARATUS WITH ROTATING FILTER REPLACEMENT MECHANISM,” a filter assembly having a rotator actuating mechanism including a first internal rotator and a second internal rotator is taught as an efficient way to insert, lock, and remove the filter housing from its base. A simple push mechanism actuates the self-driving release and change over means that hold and release the filter housing sump, and provide influent shutoff to prevent leaking and spillage. Rotational shutoff and locking mechanisms are activated and released by axial force on the filter housing at the commencement of the filter changing procedure.

The instant invention is particularly useful as the water filtering system for a refrigerator having water dispensing means and, optionally, an ice dispensing means. The water used in the refrigerator or water and ice may contain contaminants from municipal water sources or from underground well or aquifers. Accordingly, it is advantageous to provide a water filtration system to remove rust, sand, silt, dirt, sediment, heavy metals, microbiological contaminants, such as Giardia cysts, chlorine, pesticides, mercury, benzene, toluene, MTBE, Cadmium bacteria, viruses, and other know contaminants. Particularly useful water filter media for microbiological contaminants include those found in U.S. Pat. Nos. 6,872,311, 6,835,311, 6,797,167, 6,630,016, 5,331,037, and 5,147,722, and are incorporated herein by reference thereto. One of the uses of the instant filter apparatus is as a water filtration apparatus for a refrigerator. Refrigerators are appliances with an outer cabinet, a refrigeration compartment disposed within the outer cabinet and having a rear wall, a pair of opposing side walls, at least one door disposed opposite the rear wall, a top and a bottom and a freezer compartment disposed in the outer cabinet and adjacent to the refrigeration compartment. It is common for refrigerators to have a water dispenser disposed in the door and in fluid communication with a source of water and a filter for filtering the water. Further, it is common for refrigerators to have an ice dispenser in the door and be in fluid communication with a source of water and a filter for filtering the water. It has been found that the filter assembly of the instant invention is useful as a filter for a refrigerator having a water dispenser and/or an ice dispenser.

SUMMARY OF THE INVENTION

The present invention is directed to, in a first aspect, a filter base for receiving a complementary mating filter housing assembly, the filter base comprising: a base platform having fluid ingress and egress ports; and a wire harness assembly for establishing an electrical connection between the filter base and the complementary mating filter housing assembly, the wire harness assembly including: a first connector; a second connector; conductors extending between the first and second connectors; one or more contacts provided on the second connector, the one or more contacts being flexible from a first position to a second position when a mating portion of the one or more contacts engages a mating connection surface of the complementary mating filter housing assembly; and a connector housing integral with or connected to the base platform, the connector housing having an upper surface and an oppositely facing lower surface and contact-receiving enclosures extending from the upper surface, the contact-receiving enclosures dimensioned to receive a first end portion of the one or more contacts.

The one or more contacts may include termination sections mounted on the second connector at the first end portion and received in the contact-receiving enclosures, compliant sections extending from the termination sections, and substrate engagement sections extending from the compliant sections, and wherein the one or more contacts mating portions comprise the substrate engagements sections.

The one or more contacts termination sections may include folded over areas proximate free ends forming insulation displacement slots cooperating with the conductors extending between the first and second connectors.

The filter base further including contact-receiving projections extending from the connector housing lower surface, the contact-receiving projections including slots dimensioned to receive and retain a portion of the folded over areas of the termination sections of the one or more contacts therein.

The filter base further including conductor-receiving conduits integral with the connector housing upper and lower surfaces, the conductor-receiving conduits dimensioned to receive a portion of the conductors extending between the first and second connectors, wherein the conductors positioned in the conductor-receiving conduits extend through the contact-receiving enclosures.

The mating connection surface may be a circuit pad of a printed circuit board of the complementary mating filter housing assembly, and wherein the one or more contacts mating portions have curved contact sections configured to be positioned in mechanical and electrical engagement with the circuit pads when the complementary mating filter housing assembly is received within the filter base.

The connector housing is partially disposed within laterally-extending slotted portions of the base platform.

In a second aspect, the present invention is directed to a combination filter base and filter housing assembly, the combination comprising: a filter base having fluid ingress and egress ports on a base platform; a wire harness assembly for establishing an electrical connection between the filter base and the filter housing assembly, the wire harness assembly including: a first connector; a second connector; conductors extending between the first and second connectors; one or more contacts provided on the second connector, the one or more contacts being flexible from a first position to a second position when curved contact sections of the one or more contacts engage a mating connection surface of the complementary mating filter housing assembly; and a connector housing integral with or connected to the base platform, the connector housing having an upper surface and an oppositely facing lower surface and contact-receiving enclosures extending from the upper surface, the contact-receiving enclosures dimensioned to receive a first end portion of the one or more contacts; and a filter housing for enclosing a filter media, the filter housing having a body and a top portion for forming a fluid-tight seal with the body, the filter housing top portion including the mating connection surface for engaging the one or more contacts mating portions to establish an electrical connection between the filter base and the filter housing assembly, the mating connection surface structured to be in mechanical and electrical engagement with the curved contact sections of the one or more contacts when the filter housing is received within the filter base.

The one or more contacts may have termination sections mounted on the second connector at the first end portion and received in the contact-receiving enclosures, compliant sections extending from the termination sections, and substrate engagement sections extending from the compliant sections, and wherein the one or more contacts curved contact sections comprise the substrate engagements sections.

The filter base one or more contacts are flexible from a first position to a second position when the curved contact sections of the one or more contacts engage the mating connection surface of the filter housing top portion.

The mating connection surface may be a circuit pad of a printed circuit board located on or connected to the filter housing top portion.

A printed circuit board housing is located on or connected to the filter housing top portion, the printed circuit board housing including a recess for receiving the printed circuit board therein and for connecting the printed circuit board to the filter housing top portion.

The filter housing top portion includes ingress and egress ports positioned along a chord line that does not intersect an axial center of the filter housing top portion, such that a diameter line extending perpendicularly through the chord line is dissected in unequal parts, the ingress and egress ports received within ingress and egress stanchions of the filter base.

The filter housing top portion ingress and egress ports each extend vertically upwards from the filter cartridge housing top portion in a direction parallel to the axial center, wherein each of the ingress port and egress port have at least one portion or segment approximately cylindrical in cross-section, including a first segment forming a top portion of the ingress port and egress port, a third segment adjacent the housing top portion, and a second segment located between the first and third segments having at least one aperture or cavity for fluid flow, the first segment and third segment having a first diameter, and the second segment having a second diameter unequal to the first diameter.

The ingress port and egress port second segments may be formed in an hourglass shape.

The ingress port second segment cavity and the egress port second segment cavity are exposed in a direction opposite the filter housing top portion mating connection surface.

The combination further including: a filter key located on or connected to the filter housing top portion, the filter key including an extended attachment member having a bottom surface being at least partially exposed, the filter key attachment member bottom surface being releasably engageable with a top surface of the at least one shaped protrusion when the filter key is inserted within a locking member located on the filter base in an axial insertion direction, such that extraction of the filter housing assembly is prohibited.

The combination further including an electronic circuit component housing disposed adjacent to the filter key and having a recess for receiving an electronic circuit component therein and for further connecting the electronic circuit component to the filter housing top portion, the mating connection surface in electrical communication with the electronic circuit component.

In a third aspect, the present invention is directed to a method for attaching a filter housing assembly to a filter base, the filter base including a base platform and a wire harness assembly for establishing an electrical connection between the filter base and the filter housing assembly, the wire harness assembly including a first connector, a second connector, conductors extending between the first and second connectors, and one or more contacts provided on the second connector and being flexible from a first position to a second position when curved contact sections of the one or more contacts engage a mating connection surface of a complementary mating filter housing assembly, and further including a connector housing integral with or connected to the base platform, the connector housing having an upper surface and an oppositely facing lower surface and contact-receiving enclosures extending from the upper surface, the contact-receiving enclosures dimensioned to receive a first end portion of the one or more contacts, the method comprising: inserting ingress and egress ports of the filter housing assembly into ingress and egress stanchions of the filter base to generate a resilient extraction force in an axial insertion direction; inserting a filter key of the filter housing assembly into a locking member of the filter base; while inserting, engaging a mating connection surface of the filter housing with the one or more contacts curved contact sections to establish an electrical connection between the filter base and the filter housing assembly, such that the wire assembly one or more contacts flex from a first position to a second position and maintain engagement with the mating connection surface during the flexing; and releasing the filter housing assembly so that the resilient extraction force acts on the filter key attachment member in an axial extraction direction to mate the filter key attachment member bottom contacting surface with the top surfaces of the locking member opposing drive keys, such that extraction of the filter housing assembly is prohibited.

In a fourth aspect, the present invention is directed to a refrigerator comprising a filter base configured to receive a filter cartridge assembly wherein the filter base comprises: a base platform having fluid ingress and egress ports; and a wire harness assembly for establishing an electrical connection between the filter base and the complementary mating filter housing assembly, the wire harness assembly including: a first connector; a second connector; conductors extending between the first and second connectors; one or more contacts provided on the second connector, the one or more contacts being flexible from a first position to a second position when a mating portion of the one or more contacts engages a mating connection surface of the complementary mating filter housing assembly; and a connector housing integral with or connected to the base platform, the connector housing having an upper surface and an oppositely facing lower surface and contact-receiving enclosures extending from the upper surface, the contact-receiving enclosures dimensioned to receive a first end portion of the one or more contacts; and wherein the filter cartridge assembly includes a housing having a substantially cylindrical body and a top portion for forming a fluid-tight seal with the body, the housing top portion having an axial center and further including: an ingress port and egress port extending from the housing top portion, each of the ingress port and egress port having a body with a top segment, a middle segment, and a bottom segment adjacent to the housing top segment and in fluid communication with the cylindrical body, the ingress port and egress port top segments having at least one seal at the junction with the middle segments, and the ingress port and egress port bottom segments having at least one seal at the junction with the middle segments, each of the seals having an outer surface first diameter, and the ingress port and egress port middle segments having an outer surface with a diametric extension less than the ingress port and egress port respective seal first diameters, such that the ingress port middle segment and egress port middle segment are formed in an hourglass shape; a filter key located on or connected to the housing for mating attachment to the filter base, the filter key comprising an extended finger including on one side a contacting portion forming a first angle in a first direction with respect to the housing top portion and an adjacent side forming a second angle in the first direction with respect to the housing top portion, such that the first angle and the second angle are not equal; and optionally an electronic circuit component housing disposed adjacent to the filter key and having a recess for receiving an electronic circuit component therein, and for further connecting the electronic circuit component to the housing top portion, the electronic circuit component housing located on or connected to the filter cartridge assembly housing.

It is an object of this invention to provide a filter housing apparatus mounted to a base and having an automatic locking mechanism for simple replacement and removal.

It is another object of this invention to provide a filter housing apparatus mounted on a surface having non-rotating locking means with pressure activation for replacement and removal.

It is a further object of this invention to provide a filter housing apparatus for use with water dispensing and\ or ice dispensing apparatus whereby filtered water is provided to the water dispensing and/or ice dispensing apparatus.

It is still another object of this invention to provide a filter base apparatus for establishing an electrical connection between the filter base and a mating filter housing assembly that allows for electronic authentication of the filter housing assembly, or for analyzing other criteria associated with a filter cartridge, such as whether the filter media in a replaceable filter cartridge has reached the end of its useful life.

BRIEF DESCRIPTION OF THE DRAWINGS

The features of the invention believed to be novel and the elements characteristic of the invention are set forth with particularity in the appended claims. The figures are for illustration purposes only and are not drawn to scale. The invention itself, however, both as to organization and method of operation, may best be understood by reference to the description of the embodiment(s), which follows, taken in conjunction with the accompanying drawings in which:

FIG. 1A is a top exploded view of one embodiment of the filter assembly of the present invention.

FIG. 1B is a side plan view the embodiment of the filter housing assembly of FIG. 1A.

FIG. 1C depicts a perspective view of the filter housing assembly with strengthening ribs extending at least partially down the outer surface of the filter housing.

FIG. 2A is a perspective view of one embodiment of the filter key of the present invention.

FIG. 2B is a lateral side view of the filter key of FIG. 2A.

FIG. 2C depicts a bottom plan view of the filter key of FIG. 2A showing a groove and a locking nub or tab for attachments.

FIG. 2D depicts a perspective view from the opposite side of the filter key of FIG. 2C.

FIG. 2E depicts a bottom view of the filter key of FIG. 2A.

FIG. 2F is a longitudinal side view of the filter key of FIG. 2A.

FIG. 2G depicts a slotted groove which includes a wider upper portion for securely affixing the filter key to the filter head or filter manifold.

FIG. 2H is a side view of the filter key depicting an angled, ramp segment, which at least partially extends the length of the bottom surface of the filter key.

FIG. 2I depicts the complementary angled ramp segment for the filter key of FIG. 2H.

FIG. 2J depicts a side view of a partial section of the filter head showing a mating protrusion for interlocking with the slotted groove on the filter key, and complementary angled ramp segments for interlocking with the ramp segments on the filter key bottom edges.

FIG. 3A depicts a perspective view of one embodiment of the floating lock or sliding lock of the present invention.

FIG. 3B is a perspective view from the opposite side of the floating lock of FIG. 3A.

FIG. 3C is a lateral side view of the floating lock of FIG. 3A.

FIG. 3D depicts a top view of the floating lock of FIG. 3A.

FIG. 3E depicts cross-sectional longitudinal side view of the floating lock of FIG. 3A.

FIG. 4A is a perspective view of one embodiment of the filter manifold.

FIG. 4B is a top plan view of a second embodiment of the filter manifold with an extension support member.

FIG. 4C is a perspective view of a second embodiment of the filter manifold.

FIG. 5A is a side view of one embodiment of the filter head of the present invention.

FIG. 5B is a bottom perspective view of the filter head of FIG. 5A.

FIG. 5C is a top perspective view of the filter head of FIG. 5A.

FIG. 5D is another embodiment of the filter head with a snap fit lock for the filter key.

FIG. 5E is a bottom perspective view of the filter head of FIG. 5D.

FIG. 5F is a top perspective view of the filter head depicting the aperture for receiving the filter key.

FIG. 5G depicts a one-piece or integrated filter head/filter manifold construction having ingress and egress ports for fluid flow.

FIG. 5H is a side view of the integrated, one-piece filter head of FIG. 5G.

FIG. 5I is a bottom view of the integrated, one-piece filter head of FIG. 5G, depicting an off axial center cylinder for receiving an end cap port of the filter cartridge.

FIGS. 6A and 6B are exploded views of a second embodiment of the filter assembly of the present invention, showing a filter key having an extended boss.

FIG. 7A is a top perspective view of an embodiment of the filter key of the present invention having an extended boss.

FIG. 7B is a bottom perspective view of the filter key of FIG. 7A.

FIG. 7C depicts a top plan view of the filter key of FIG. 7A.

FIG. 7D depicts a side plan view of the filter key of FIG. 7A.

FIG. 7E depicts an end or lateral side view of the embodiment of the filter key of FIG. 7A, showing the boss rising above the plane created by the fingers, and two wings extending laterally outwards from the boss.

FIG. 7F is a perspective view of another embodiment of the filter key of the present invention showing a locking nub located on the bottom portion on a lateral side.

FIG. 8A depicts a perspective view of an embodiment of the floating lock of the present invention.

FIG. 8B is a top view of the floating lock of FIG. 8A.

FIG. 8C is a cross-sectional view of the floating lock of FIG. 8A depicting a drive key located at one end of the floating lock on the longitudinal or side panel.

FIG. 8D depicts an exploded view of the drive key of FIG. 8C showing the edge angle and face.

FIG. 8E depicts a perspective view of a floating lock having an extension member.

FIG. 8F is a side view of the floating lock of FIG. 8E having an extension member.

FIG. 8G is a lateral or cross-sectional view of the floating lock of FIG. 8E with an extension member.

FIG. 9A is a perspective view of a non-floating port of the present invention.

FIG. 9B is a top plan view of the non-floating port of FIG. 9A.

FIG. 10A is a top plan view of one embodiment of the rear plate of the present invention.

FIG. 10B is a bottom perspective view of the rear plate of FIG. 10A.

FIG. 10C is a top plan view of a second embodiment of the rear plate of the present invention.

FIG. 11 is an exploded view of a filter assembly of the present invention, showing a filter key having a boss, connected to a filter manifold having extension supports.

FIG. 12A is a front elevational view of another embodiment of a filter assembly of the present invention.

FIG. 12B is a front top perspective view of the filter assembly of FIG. 12A.

FIG. 12C is a rear top perspective view of the filter assembly of FIG. 12A.

FIG. 12D is a rear elevational view of the filter assembly of FIG. 12A.

FIG. 12E is a partial, expanded rear top perspective view of the filter assembly of FIG. 12A.

FIG. 13A is a front top perspective view of a filter key used with the filter assembly embodiment of FIG. 12A.

FIG. 13B is a rear perspective view of the filter key of FIG. 13A.

FIG. 13C is a side elevational view of the filter key of FIG. 13A.

FIG. 14A is a top-down view of an embodiment of the filter assembly of FIG. 12A, with a printed circuit board directly affixed to the filter housing top portion without a PCB housing.

FIG. 14B is a partial perspective view of the filter assembly embodiment of FIG. 14A.

FIG. 14C is a partial front elevational view of the filter assembly of FIG. 14A.

FIG. 14D is a partial side elevational view of the filter assembly of FIG. 14A.

FIG. 15 is a top perspective view of an embodiment of an electrical connector and wire harness for use in a filter assembly according to the present invention.

FIG. 16 is a bottom perspective view of the electrical connector and wire harness of FIG. 15.

FIG. 17 is an exploded perspective view of the electrical connector and wire harness of FIG. 15.

FIG. 18 is an enlarged view of several contacts of the electrical connector of FIG. 17.

FIG. 19 is a top perspective view of a second embodiment of an electrical connector and wire harness for use in a filter assembly according to the present invention.

FIG. 20 is a bottom perspective view of the electrical connector and wire harness of FIG. 19.

FIG. 21 is an exploded perspective view of the electrical connector and wire harness of FIG. 19.

FIG. 22 is an upward-facing perspective view of another embodiment of a filter base according to the present invention.

FIG. 22A is a downward-facing perspective view of the filter base of FIG. 22.

FIG. 23 is top perspective view of a third embodiment of an electrical connector and wire harness for use in a filter assembly according to the present invention.

FIG. 24 is a bottom perspective view of the electrical connector and wire harness of FIG. 23.

FIG. 25 is a perspective view of a filter base including an electrical connector and wire harness for connection to a mating filter housing assembly according to the present invention.

FIG. 26 is an enlarged perspective view of the filter base and wire assembly of FIG. 25.

FIG. 27 is a bottom plan view of the filter base and wire assembly of FIG. 25.

FIG. 28 is a perspective view of the filter base and wire assembly of FIG. 24 in combination with a mating filter housing assembly.

FIG. 29 is an enlarged perspective view of the combination filter assembly of FIG. 28.

FIG. 30 is an upward-facing perspective view of the floating lock of FIG. 27.

FIG. 30A is an enlargement of the device key of FIG. 30, depicting a receiving wedge having an extended shelf portion.

FIG. 31 is a perspective view of an exemplary refrigerator according to embodiments of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENT(S)

In describing the embodiment(s) of the present invention, reference will be made herein to FIGS. 1 to 31 of the drawings in which like numerals refer to like features of the invention. Features of the invention are not necessarily shown to scale.

Certain terminology is used herein for convenience only and is not to be taken as a limitation of the invention. For example, words such as “upper,” “lower,” “left,” “right,” “horizontal,” “vertical,” “upward,” “downward,” longitudinal, lateral, radial, “clockwise,” or “counterclockwise” merely describe the configuration shown in the drawings. Indeed, the referenced components may be oriented in any direction and the terminology, therefore, should be understood as encompassing such variations unless specified otherwise. For purposes of clarity, the same reference numbers may be used in the drawings to identify similar elements.

Additionally, in the subject description, the words “exemplary,” “illustrative,” or the like are used to mean serving as an example, instance, or illustration. Any aspect or design described herein as “exemplary” or “illustrative” is not necessarily intended to be construed as preferred or advantageous over other aspects or design. Rather, the use of the words “exemplary” or “illustrative” is merely intended to present concepts in a concrete fashion.

The present invention is directed to a filter housing assembly for filtration of liquids, including the interception of chemical, particulate, and/or microbiological contaminants. The use of the mechanical locking assembly of the filter housing without the need for excess force and tight tolerances essential in prior art filter housings makes for easy and frequent filter changes and optimal filter performance. The filter housing assembly of the present invention provides simplified filter changes to minimize process downtime and without recourse to tools. A simple push mechanism actuates the self-driving release and change over means that hold and release the filter housing sump or filter cartridge, and provides influent shutoff means to prevent leaking and spillage. A floating lock or sliding lock responsive to an axial insertion force from the filter cartridge moves perpendicular or radially to the axial motion of the sump, and allows a specific connector piece or filter key to insert within the floating lock. Once inserted, the floating lock retracts towards its original position under a resilient force, such as two springs in tandem, or other complementary resilient mechanism keeping the floating lock under retraction tension when moved from its initial position. The filter key and floating lock combination allows for the identification of specific filter models and may be configured to reject all but specific filter types.

Removal of the filter cartridge is performed in the same manner. An axial insertion force causes the floating lock to move radially, which allows the filter key to be removed from the floating lock. An extraction force provided by spring tension, or the like, helps push the filter cartridge out of its base. Fluid shutoff and locking mechanisms are initiated by the axial force on the filter cartridge at the commencement of the filter changing procedure.

The present invention is described below in reference to its application in connection with, and operation of, a water treatment system. However, it should be apparent to those having ordinary skill in the art that the invention may be applicable to any device having a need for filtering liquid.

FIG. 1A is a top exploded view of an embodiment of the filter assembly of the present invention. The filter assembly is fixably secured in a position within an operating environment requiring fluid filtration, such as attached to an internal sidewall of a refrigerator, although certainly other operating environments may be envisioned, and the filter assembly may be used in any number of environments where the filter assembly has access to, and can be placed in fluid communication with, influent and effluent fluid access ports. For illustrative purposes only, application to the filtering of water being piped into a refrigerator is discussed.

A filter housing assembly 200 comprises the removable, detachable filter cartridge or sump of the filter assembly from a filter base 100. Filter housing assembly 200 includes a filter housing 1, which encloses filter media 8, a filter head 2 that attaches at one end to filter housing 1, and attaches at the other end to a filter manifold 3 and non-floating port 11. A connector piece or filter key 5 is attached to filter manifold 3. Filter base 100 includes non-floating port 11 having a base platform 1104, locking member or floating lock 12, and rear plate 13. Filter head 2 secures in a water-tight fit to filter housing 1. The attachment scheme may be made by a water-tight screw fit, bond, weld, or other water-tight fastening mechanism commonly used in the art for sealing adjoining components, typically adjoining plastic components. As discussed in further detail below, filter key 5 is connected to filter manifold 3. Filter key 5 may be formed as one piece with filter manifold 3, or may be securely attached by other methods, such as bonding, welding, press fit, friction fit, or the like. Filter key 5 may also be removably attached for replacement by an end user. Filter manifold 3 is attached to filter head 2. Filter media 8 is located in filter housing 1. Each end of filter media 8 is secured by a cap that facilitates the direction of the fluid being treated by the filter. At one end, filter media 8 is secured by a closed end cap 7, and at the other end by open end cap 6. Filter media 8 may be any filter media known in the art, and preferably, is a carbon block filter. It is typically shaped in a similar fashion as filter housing 1, which in an embodiment is cylindrical. Open end cap 6 is designed to interface and be in fluid communication with filter head 2.

In another embodiment, filter housing 1 may include strengthening ribs 16 longitudinally located on the filter housing outer surface. FIG. 1C depicts a perspective view of filter housing assembly 200 with a row of strengthening ribs extending at least partially down the outer surface of filter housing 1. Strengthening ribs 16 also function as a guide for inserting filter housing assembly 200 into a shroud (not shown) that may be part of the installation assembly for ensuring proper alignment with filter base 100. Strengthening ribs 16 are preferably integral with filter housing 1, but may also be attachable as a separate component part. Ribs 16 may extend the full length of filter housing 1, or as shown, may extend to an intermediate point between filter housing assembly 200 end caps 6, 7.

Filter housing assembly 200 is a finished assembly including filter housing 1, which encompasses filter media 8 by closed end cap 7 at one end, and open end cap 6 at the other. Generally, o-ring seals, such as o-ring seal 9, are used to prevent water leakage where different components are expected to mate. Filter manifold 3 and filter key 5 are joined with filter head 2, and secured to filter housing 1 to form the assembled filter housing apparatus 200. These components may be integral, permanently secured, or removably attached to one another, and to filter head 2. FIG. 1B is a side plan view of an embodiment of the filter assembly of the present invention.

FIG. 2A is a perspective view of connector piece or filter key 5.

FIG. 2B is a lateral side view of filter key 5. As previously noted, the bottom of filter key 5 is attached to filter manifold 3 by any number of fastening schemes, or may be integrally formed with filter manifold 3.

FIG. 2C depicts a groove 51 that is preferably shaped to receive a complementary protrusion on filter manifold 3, and is preferably shaped to receive a dovetail protrusion; however, other connecting, complementary shapes are not excluded.

For example, FIG. 2G depicts a slotted groove 51 b that is not a dovetail joint. Slotted groove 51 b may include a wider upper portion 51 c to more securely affix filter key 5 to filter manifold 3. The connection of filter key 5 with filter manifold 3 may be bonded, sonic welded, press fitted, friction fitted, or the like. Moreover, filter key 5 may be integral with filter manifold 3. Similarly, filter manifold 3 may be bonded, sonic welded, press fitted, friction fitted, or integral with the filter housing top portion. As depicted in the illustrative embodiment, groove 51 is shaped to accept a snap feature for a press or snap fit located on filter manifold 3. In this manner filter key 5 may be removably attached to filter manifold 3. Similarly, filter manifold 3 may be designed to be removably attached to filter head 2. Thus, the design has more flexibility to introduce and accommodate different key configurations, which can be used to designate specific filter types, and purposely reject other filter types. Additionally, filter key 5 may include an angled, ramp segment 59 a on at least its bottom edges where filter key 5 slidably mates with the top surface of filter manifold 3 or filter head 400.

FIG. 2H is a side view of filter key 5 depicting angled ramp segment 59 a, which at least partially extends the length of the bottom surface of filter key 5. Angled ramp 59 a is located at one end of the bottom edges of filter key 5 and extends into the filter key main body 5 a.

FIG. 2I depicts a perspective view of filter head 400 with complementary angled ramp segments 59 b for mating with angled ramp segments 59 a of filter key 5. Angled ramp segment 59 a matably adjoins complementary angled ramp segment 59 b to interlock and assist in securing filter key 5 to filter head 400. For the two piece design utilizing filter manifold 3, complementary angled ramp segments 59 b are formed on the top surface of filter manifold 3.

FIG. 2J depicts a side view of a partial section of filter head 400 showing mating protrusion or rail 321 for interlocking with slotted groove 51 b, and complementary angled ramp segments 59 b.

FIG. 4A depicts a perspective view of the one embodiment of filter manifold 300. Port 310 is shown off center of filter manifold 300. FIG. 4A depicts the filter manifold without extension support members. Preferably, port 310 is an outlet port; however, the present invention is not limited to a specific ingress and egress location, and may have these ports interchanged. When port 310 is used as an egress or outlet port, filter manifold 300 takes fluid from filter media 8 through the center port of open cap 6, and directs fluid flow radially outwards from the axial center to port 310. In this embodiment, the ingress port is located on filter head 2. By locating the ingress and egress ports off axis, filter housing assembly 200 has a more robust design, with enhanced structural integrity for mounting to the filter base, and for remaining fixably in place during attachment.

Referring to FIGS. 4A-4C, in a preferred attachment scheme for filter key 5, a protrusion or rail 32 or 320 is formed on or near the center line of filter manifold 3 or 300. Protrusion or rail 32 or 320 is preferably a rectangular shaped segment extending above circular center portion 33 or 330. Protrusion or rail 32 allows for precise alignment of filter key 5, while providing a robust connection. Preferably, a dovetail shape, press fit, or friction fit interconnection between protrusion 32 and groove 51 of filter key 5 permits the user to remove and replace filter key 5. This allows for the designation of specific filter keys, and correspondingly, specific filter cartridges. Protrusion or rail 32, 320 may be integrally formed with filter manifold 3 or 300, respectively, and filter manifold 3 may be integrally formed with the filter housing top portion. Or these components may be separately fabricated and attached by bond, weld, press fit, friction fit, or other suitable means known in the art. Preferably, protrusion or rail 32, 320 has a dovetail shaped surface for slidably mating with complementary groove 51 of filter key 5.

In the embodiment depicted by FIGS. 4B and 4C, protrusion 32 may be on an extension support 34. FIG. 4B depicts a top level view of filter manifold 3, showing extension support 34 extending longitudinally or radially outward from center portion 33, along a radius. Extension support 34 supports optional shroud 4 that covers and protects filter head 2. Filter manifold 3 or 300 seats within and attaches to filter head 2.

FIG. 5A depicts a side view of one embodiment of filter head 2. Filter head 2 is shown with off-center port 21. In this manner, port 21 of filter head 2 and port 31 of filter manifold 3 are both off-center and parallel to one another about a plane that approximately intersects the center point of filter head 2. As shown in FIGS. 1, 4, and 5, a recessed portion 22 formed about the center point of filter head 2 receives center portion 33 of filter manifold 3. If extension support 34 is used with filter manifold 3, when filter manifold 3 is inserted within filter head 2, extension support 34 is situated approximately perpendicular to the plane formed by ports 21 and 31. Extension support 34 provides at each end a snap fit design for shroud 4.

FIG. 5B is a bottom perspective view of the filter head.

FIG. 5C is a top perspective view of filter head 2 depicting recess portion 22.

Filter head 210 depicts another embodiment as shown in FIGS. 5D-5F. In this embodiment, as depicted in the top perspective view of FIG. 5F, on the top surface of filter head 210 is a curved receiving boss or support member 230 located on one side of the center point, and two parallel, lateral support members 240 a,b located opposite curved boss 230 on the other side of the center point of filter head 210. These structural support members are used to align filter key 5 to filter head 210, and help secure filter key 5. This filter head may be used in conjunction with the filter manifold 300 without extension supports, as depicted in FIG. 4A. Structural support member 230 provides a physical stop for filter key 5, which typically slides on protrusion 32 provided by filter manifold 300. Lateral support members 240 a,b are used to align filter key 5, and prevent it from inadvertent shifting. FIG. 5E is a bottom perspective view of filter head 210. FIG. 5D is a side view of filter head 210.

In another embodiment, filter head 2, 210 may be integral with filter manifold 3, 310, such as for example, a one piece construction in the form of a single injected molded piece, or a two piece construction with filter manifold 3, 310 welded, fused, or otherwise permanently attached to filter head 2, 210 as a subassembly.

FIG. 5G depicts a one-piece or integrated filter head/filter manifold construction 400 having ingress and egress ports 410 a,b. Protrusion 420 is preferably a shaped segment extending above, and off axis from, the circular center of filter head 400. Protrusion 420 allows for precise alignment of filter key 5, while providing a robust connection. A dovetail shape, press fit, or friction fit interconnection between protrusion 420 and groove 51 of filter key 5 permits the user to remove and replace filter key 5.

FIG. 5H is a side view of integrated, one-piece filter head 400. Cylindrical wall 424 is sized to receive the open end cap 6 of filter housing 1. Cylindrical wall 426 is off the axial center of filter head 400 and is configured to receive the center axial port of end cap 6, redirecting fluid flow off the axial center such that port 410 b is within cylinder 426, and port 410 a is outside of cylinder 426. This redirection of fluid flow performs a similar function as filter manifold 3, 310 without the need of aligning the center axial port of end cap 6 with a filter manifold aperture.

FIG. 5I is a bottom view of the integrated, one-piece filter head of FIG. 5G, depicting off axial center cylinder 426 for receiving a port of open end cap 6 of the filter cartridge. A comparison to FIGS. 5B and 5E which depict perspective views of the underside of filter head 2, 210 respectively, with FIG. 5I, demonstrates the absence of an axially centered cylinder for receiving the port from open end cap 6 in the integrated filter head 400 design.

Filter manifold 300 includes an off-center port 310, as well as a center portion 330 that fits securely within recess 220 of filter head 210. Protrusion 320 receives the groove from filter key 5. In this embodiment, when filter key 5 is slidably inserted within protrusion 320, structural support member 230 and lateral structural support members 240 a,b secure filter key 5. The curved portion of structural support member 230 forces filter key 5 to be inserted in one direction only. An added boss 232, located on the top of filter head 210 and centered between lateral support members 240 a,b may be employed to serve as a lock or snap fit for filter key 5. Additionally, in another embodiment, structural support member 230 may be formed with a small aperture 235 located directly away from the center point of filter head 210 at its base where support member 230 meets the top portion of filter head 210. This small aperture 235 is designed to receive a protruding material or locking nub or tab 53 placed at, or formed with, the corresponding end portion of filter key 5 on the lower end of a lateral side. Locking nub or tab 53 on filter key 5 is inserted within small aperture 235 on the curved portion of structural support member 230 and prevents axial removal of filter key 5 away from filter head 210. FIGS. 2A-2F show locking nub 53 located on the bottom portion of a lateral side of filter key 5. FIG. 5D is a side view of filter head 210 depicting aperture 235 for receiving filter key 5.

Filter key 5 includes at least one attachment member, such as laterally extending finger 52, and preferably a plurality of extending fingers, as depicted in FIGS. 2A-2F. FIG. 2C is a bottom perspective view of filter key 5. In a first illustrative embodiment, filter key 5 is shown with ten laterally extending fingers 52. Fingers 52 are preferably constructed of the same material as, and integrally formed with, base 55 of filter key 5. However, the fingers may also be removably attached, and the filter key design is not limited to an integrally formed construction. The laterally extending fingers 52 may form a number of different configurations. In the illustrative embodiment, there is a uniform gap 54 between each finger 52. In other configurations, a finger may be missing on one or both sides of filter key 5, and gap 54 may be wider in some places than in others. Using a digital 1, 0 designations to indicate a finger (1) or a gap (0), it is possible to have many different configurations for a filter key. The configuration as shown in FIG. 2E would be designated on each side as 101010101. As a separate example, for a designation of 100010101, this would represent a lateral finger (1) followed by a wide gap (000), and then a finger (1) followed by a gap (0) and a finger (1) followed by another gap (0), and one last finger (1). The present invention is not limited to any particular finger/gap order. Additionally, it is not necessary for the finger/gap configuration on one side of filter key 5 to be symmetric with the finger/gap configuration on the opposite side. By having different finger/gap configurations, it is possible to make a mechanical key identifier for the specific filter housing assembly being employed. Filter key 5 may also be color-coded to facilitate identification for different filter cartridges or housing assemblies. It may also be textured, mirrored, transparent, translucent, materially modified, or having a conductively signature, or any combination thereof, for identification purposes. More importantly, aside from identification of the filter housing assembly, a particular filter key finger/gap configuration will only allow for the use of a specific filter housing assembly in a given system.

Fingers 52 of filter key 5 are strength bearing attachment members, used to mate with, or interlock with, corresponding protrusions or drive keys 123 a,b located on longitudinal sides of locking member or floating lock 12 as depicted in FIG. 3. There must be at least one protrusion or drive key on floating lock 12 that corresponds to, and lines up with, at least one finger or attachment member on filter key 5, so that when filter key 5 is inserted to mate with floating lock 12, the drive keys slidably contact the fingers and floating lock 12 is shifted longitudinally an incremental amount to allow fingers 52 on filter key 5 to traverse between the gaps 122 on floating lock 12. Once fingers 52 have passed between the corresponding gaps on floating lock 12, which is slidably restrained under tensional forces, floating lock 12 is partially returned towards its original position by the tensional retraction forces so that at least one extended finger on filter key 5 aligns or interlocks with at least one protrusion or drive key on floating lock 12, and the alignment resists any direct outward, axial extraction forces.

Each attachment member or finger 52 of filter key 5 includes a slanted face 58 as depicted in FIGS. 2A and 2F. These angled features are made to slidably contact complementary slanted edge or angled features 121 a,b of drive keys 123 a,b of floating lock 12 shown in FIGS. 3A and 3E. During insertion of filter key 5, the sliding contact of the angled feature of the filter key's fingers transversely shifts floating lock 12 off of its initial position, and allows the fingers of filter key 5 to be inserted within gaps 122 between the drive keys 123 a,b.

A perspective view of locking member or floating lock 12 is depicted in FIGS. 3A and 3B. Floating lock 12 has angled-faced fingers, protrusions, or drive keys 123 a,b and gaps 122 that may reciprocally correspond to fingers 52 and gaps 54 located on filter key 5. It is not necessary for the drive key/gap configuration of floating lock 12 to be exactly complementary to the finger/gap configuration of filter key 5. It is only necessary that floating lock 12 is able to fully receive the inserting filter key 5 when filter housing assembly 200 is axially inserted into filter base 100. Each protrusion or drive key 123 a,b of floating lock 12 is shaped with a receiving wedge 129 a,b, respectively, opposite slanted portion or edge 121 a,b to capture fingers 52 of filter key 5. Fingers 52 may have a cross-sectional diamond shape to facilitate the capture by the drive key receiving wedge 129 a,b. Drive keys 123 a,b are placed on at least one longitudinal side of floating lock 12, as depicted in FIGS. 3D and 3E. Underneath and centered between drive keys 123 a,b is a row of position stops 125 forming a track structure extending longitudinally along floating lock 12. Position stops 125 preclude fingers 52 from extending any further during insertion. There need not be a position stop 125 for each drive key 123 a,b, provided there is at least one position stop 125 to prohibit over insertion of filter key 5. Position stops 125 also include a slanted or angled face 126 for slidable contact with slanted face 58 of fingers 52 on filter key 5. Position stops 125 are shown as a row of jagged edges, but do not have to correspond one-for-one with drive keys 123 a,b.

Upon insertion, when attachment members or extended fingers 52 of filter key 5 contact drive keys 123 a,b, floating lock 12 shifts away from its initial position, against retraction forces, and moves according to the contacting angled edges 58 and 121. Once wings 56 a,b of fingers 52 clear lip 127 a,b of drive keys 123 a,b, floating lock 12 is not prohibited from reacting to the retraction forces, and moves slightly back, towards its original position where diamond shaped wings 56 a,b are then trapped by receiving wedges 129 a,b. This position locks filter key 5 to floating lock 12 resisting any direct axial extraction force.

There is a gap or space 124 between the bottom most portion of drive key 123 a,b and top most portion of position stop 125. Upon extraction, when wings 56 a,b of fingers 52 are pushed within this gap or space, there is no structure preventing floating lock 12 from responding to the tensional retraction forces acting on it. Thus, floating lock 12 is free to respond to the retraction forces, and will tend to move towards its initial position. This will align fingers 52 of filter key 5 within gaps 122 of floating lock 12 and allow for easy extraction of filter housing 200.

In order to extract filter housing assembly 200, a user again pushes axially inwards on the filter housing assembly, which releases wings 56 a,b on filter key 5 from drive keys 123 a,b. This frees floating lock 12 to return to towards its original position, and locates fingers 52 on filter key 5 at gaps 122 of floating lock 12. Filter housing assembly 200 can now be freely extracted from filter base 100. Resilient members 1110 within shut-off stanchions 1101 a,b of non-floating port 11 assist in pushing or extracting filter housing assembly 200 away from filter base 100.

FIG. 9A is a perspective view of non-floating port 11, which works in tandem with rear plate 13 or rear plate 1300 to hold floating or sliding lock 12 in place while allowing it to freely move longitudinally off its center position and back to its center position during the insertion and extraction of filter housing assembly 200. As discussed further herein, the base platform 1104 of non-floating port 11 will also hold locking members such as floating lock 1200 and floating lock 1212 of FIG. 8. For simplicity, reference is made chiefly to the interaction of non-floating port 11 with floating lock 12, although the applicability of non-floating port 11 includes usage with floating lock 1200 and 1212 as well. Non-floating port base platform 1104 includes a protruding encasement 1102, larger than floating lock 12, and made to enclose floating lock 12 therein. Encasement 1102 prevents over-travel of floating lock 12, and protects it when installed from extraneous, unintended movement.

FIG. 9B is a top plan view of non-floating port 11. Stanchions 1101 a,b are located on opposite sides of encasement 1102 and extend through base platform 1104. Each ingress/egress stanchion 1101 a,b has an upper stanchion portion extending perpendicularly upwards with respect to a top surface of base platform 1104 in an axial direction and a lower stanchion portion extending downwards with respect to base platform 1104 in the axial direction. Ports 1103 represent the ingress and egress ports for the fluid and extend perpendicularly to stanchions 1101 a,b. Shut-off stanchions 1101 a,b include shutoff plugs 14, which act as valve seals to stop fluid flow when the filter cartridge is being removed. Shut-off stanchions 1101 a,b are preferably cylindrical in shape, containing spring activated, o-ring sealed plugs for sealing the ingress and egress lines during filter cartridge removal. In an embodiment, rear plate 13 is snap fitted into non-floating port 11. In order to accommodate this, snap fittings 1105 are shown on non-floating port 11 that receive a corresponding fitting 135 on rear plate 13. Referring to FIG. 1, floating lock 12 is supported by non-floating port 11 and rear plate 13.

FIG. 10A is a top plan view of one embodiment of rear plate 13 of the present invention.

FIG. 10B depicts a bottom perspective view of rear plate 13. Rear plate 13 secures locking member or floating lock 12 within a support structure in non-floating port 11. Rear plate 13 is preferably attached by snap fit to non-floating port 11, although other attachment schemes known in the art may be easily employed, such as bonding, welding, and assorted mechanical fasteners. Rear plate 13 is formed with extensions 132 on each end, and shaped gaps 133 therebetween. Gaps 133 are shaped to go around shut-off stanchions 1101 a,b of non-floating port 11. In this embodiment, rear plate 13 includes a center aperture 131 that allows for longitudinal movement of floating lock 12. Floating lock 12 may include an extension member opposite the face configured with fingers and gaps, in order to permit resilient components, such as helical or torsion springs to act upon it. FIGS. 3C and 3E are side views of the floating lock showing extension member 128. FIG. 3B is a perspective view of the floating lock 12 with extension member 128. FIG. 8E depicts floating lock 1212 with extension member 1280. In these embodiments, the extension member is acted upon by resilient devices held by the rear plate.

FIG. 10C is a top plan view of another embodiment of the rear plate 1300 of the present invention. In this embodiment, the topside of rear plate 1300 includes a domed, slotted cover 1302 over the center aperture. Cover 1302 is formed to encase springs or other resilient members about the extension member 128 extending from floating lock 12. Dome 1302 includes a slot 1304 that is made to receive the extension member 128 from floating lock 12. Slot 1304 helps retain linear movement of floating lock 12 inside dome 1302. In this embodiment, two complementary resilient members, such as springs, would reside on each side of the extension member 128 of floating lock 12. One resilient member preferably applies force on the floating lock extension member in one direction, while the other resilient member applies force to the floating lock extension member in the opposite direction. In this manner, no matter which way floating lock 12 is moved or shifted, a retraction force presents itself to return floating lock 12 to its original, centered position.

At all times during insertion, the filter housing assembly is under extraction forces that tend to push the housing out of the filter base. These extraction forces result from resilient members in each shut-off stanchion 1101 a,b of non-floating port 11 (shown in FIG. 9B) that force shut-off plugs 14 into position in order to block the ingress and egress ports. Preferably, the extraction forces on shutoff plugs 14 are provided by a spring 1110 in each port, although other resilient members may be used to provide a similar result. Inserting the filter housing assembly into the filter base works against these extraction forces, and pushes shutoff plugs 14 further up each shut-off stanchion 1101 a,b of non-floating port 11. This allows for fluid ingress, while keeping the filter housing assembly under the constant extraction force.

Protective port shroud 4 may be placed over filter head 2, to protect the floating lock 12 and filter key 5 mechanism from damage and debris. Shroud 4 is preferably supported by the extension supports on the filter manifold.

FIGS. 6A and 6B are exploded views of another embodiment of the filter assembly of the present invention, showing the combination of filter manifold 300, filter key 500, and filter head 210. Filter key 500 is depicted without a locking nub or tab; however it may include a locking nub to facilitate attachment to the filter head. FIG. 7F depicts filter key 590 with locking nub or tab 501. Locking nub 501 is located at the base of filter key 590. In this embodiment, filter key 500 or 590 and filter manifold 300 are modified such that locking member or floating lock 1200 or 1212 of FIG. 8 is slidably shifted by the interaction wings 560 a,b of an extended boss 550 on filter key 500 or 590 with drive keys 1210 a,b of floating lock 1200.

Filter key 500 or 590 is inserted within floating lock 1200 through the axial insertion of the filter housing assembly into the filter base. Hammerhead shaped wings 560 a,b on fingers 520 of filter key 500 and drive keys 1210 a,b on floating lock 1200 or 1212 slidably contact one another, causing a transverse motion of floating lock 1200 or 1212 perpendicular to the axial motion of insertion. In this manner, floating lock 1200 or 1212 is shifted longitudinally, in a direction radially relative to the filter housing assembly axis. Attachment members or fingers 520 of filter key 500 are positioned within the gaps 1220 on floating lock 1200 or 1212. Once filter key 500 or 590 is inserted, floating lock 1200 or 1212 is returned partially towards its original position by retracting tensional forces, preferably by complementary spring forces, so that the fingers on floating lock 1200 or 1212 align directly with fingers 520 on filter key 500 or 590, thus preventing a direct extraction force from removing the filter housing assembly from the filter base.

FIG. 7F depicts a top perspective view of filter key 590. At one end of filter key 590 is an upwardly extended angled boss 550. Boss 550 rises above horizontal plane 570 created by the top portion of fingers 520, and is angled toward fingers 520, with its highest point at one end of filter key 500. Boss 550 angles downward from its highest point towards fingers 520. Preferably, boss 550 is an upwardly facing triangular or wedge shaped design having wings 560 a,b for interaction with drive keys 1210 a,b, respectively, on floating lock 1200.

FIG. 7E depicts an end view of filter key 500 showing a hammerhead shaped boss 550 rising above plane 570 created by fingers 520, and wings 560 a,b extending laterally from boss 550 resembling what may be considered a hammerhead shape. The purpose of wings 560 a,b is to contact corresponding angled drive keys 1210 a,b on floating lock 1200.

A perspective view of the complementary locking member or floating lock 1200 is depicted in FIG. 8A. The only difference between floating lock 1200 of FIG. 8A and floating lock 1212 of FIG. 8E is the addition of an extension member 1280 on floating lock 1212. Floating lock 1200 has fingers 1230 a,b and gaps 1220 that may reciprocally correspond to fingers 520 and gaps 540 located on filter key 500 or 590. It is not necessary for the finger/gap configuration of floating lock 1200 to be exactly complementary to the finger/gap configuration of filter key 500 or 590. It is only necessary that floating lock 1200 is able to fully receive the inserting filter key 500 when the filter housing assembly is axially inserted into the filter base. Furthermore, once floating lock 1200 is subjected to retraction forces acting to return it partially towards its original position, it is necessary that at least one attachment member or finger on filter key 500 or 590 vertically align with at least one finger on floating lock 1200 or 1212 preventing any extraction without further shifting of floating lock 1200 or 1212.

Using floating lock 1200 and filter key 500 as illustrative examples, upon slidable contact of wings 560 a,b on filter key 500 and protrusions or drive keys 1210 a,b on floating lock 1200, floating lock 1200 moves in a transverse motion, perpendicular to the axial motion of insertion. In this manner, floating lock 1200 is shifted longitudinally, in a direction radially relative to the filter housing assembly axis. Fingers 520 of filter key 500 are positioned within the gaps 1220 on floating lock 1200. Once filter key 500 is inserted, floating lock 1200 is returned partially towards its original position by retracting tensional forces, preferably by complementary spring forces, so that the fingers on floating lock 1200 align directly with fingers 520 on filter key 500, thus preventing a direct extraction force from removing the filter housing assembly from the filter base.

Extended fingers 1230 a,b are preferably constructed of the same material as floating lock 1200 and integrally formed therewith. However, fingers 1230 may also be removably attached, and the floating lock design is not limited to an integrally formed construction. Additionally, the present invention is not limited to any particular finger/gap order. It is not necessary for the finger/gap configuration on one side of floating lock 1200 to be symmetric with the finger/gap configuration on the opposite side. Floating lock 1200 is responsive to tensional forces, such as complementary springs acting on it from two separate directions to provide resistance longitudinally. Floating lock 1200 effectively moves longitudinally when acted upon by filter key 500, and is forced to return partially towards its original position after fingers 520 of filter key 500 have traversed through gaps 1220. Upon partial retraction, fingers 520 are aligned behind or underneath fingers 1230 of floating lock 1200. FIG. 8B is a top view of floating lock 1200 showing laterally extending fingers 1230 a,b and adjacent gaps 1220 between the fingers.

FIG. 8C is a cross-sectional view of locking member or floating lock 1200, depicting protrusion or drive key 1210 a, which is located at one end of floating lock 1200 on longitudinal or side panel 1240. Drive key 1210 a is opposite a similar drive key 1210 b (not shown), which is located on the opposite longitudinal panel of floating lock 1200. Both drive keys are designed to have an angled face for slidably interacting with wings 560 a,b of boss 550 on filter key 500. Each drive key is preferably integrally fabricated with floating lock 1200; however, the drive keys may be fabricated separately and attached to the longitudinal panels of floating lock 1200 by attachment means known in the art. As shown in FIG. 8C, below drive key 1210 a is a position key or physical stop 1250, preferably formed with the supporting lateral wall 1260 of floating lock 1200. As shown in FIG. 8B, position key 1250 is situated between drive keys 1210 a,b. Position key 1250 may be integrally formed with lateral wall 1260, or may be separately attached thereto by any acceptable means in the prior art, such as bonding, welding, gluing, press fitting, and the like. Position key 1250 acts as a physical stop to ensure against over travel of floating lock 1200. Position key 1250 is situated below drive keys 1210 a,b by a distance designed to accommodate the insertion of boss 550 of filter key 500. Upon insertion of filter key 500 into floating lock 1200, boss 550 traverses through gap 1270 in floating lock 1200 formed by the space between drive keys 1210 a,b. Wings 560 a,b of boss 550 extend outward relative to the width of boss 550, traversing between lateral wall 1260 and drive keys 1210 a,b. In this manner, wings 560 a,b retain floating lock 1200 from retracting back to its original position while boss 550 is being inserted. At all times, floating lock 1200 is under the retraction force of resilient members, such as tandem springs, or the like, tending to keep floating lock 1200 its original position, which is preferably a centered position. During insertion of filter key 500, wings 560 a,b interact with drive keys 1210 a,b to shift floating lock 1200 longitudinally off-center while under the resilient retraction forces. Upon full insertion, when boss 550 reaches and contacts position key 1250, wings 560 a,b are no longer held by drive keys 1210 a,b because the length of drive keys 1210 a,b is shorter than the length of boss 550. At this point in the insertion process, the tensional retraction forces shift floating lock 1200 towards its original position.

Once wings 560 a,b reach position key 1250, and the user releases the insertion force initially applied on the filter housing assembly, the extraction forces from shutoff plug springs 1110 dominate. These forces push the filter housing assembly axially outwards, away from floating lock 1200. Since wings 560 a,b are no longer bound between drive keys 1210 a,b and lateral wall 1260, floating lock 1200 will tend to shift longitudinally, partially towards its original position as filter key 500 moves slightly axially outwards. At this point, wings 560 a,b interact with edge angles 1280 a,b to push away from the center position, shifting filter key 500, and combining or contacting with face 1300 a,b to keep the filter housing from retracting. FIG. 8D depicts an exploded view of drive key 1210 a with edge angle 1290 a and face 1300 a.

Fingers 520 of filter key 500 are now aligned with fingers 1230 of floating lock 1200 and remain in contact in a vertical plane in the axial direction, prohibiting extraction of the filter housing assembly from the filter base.

FIGS. 12A-12E present yet another embodiment of a filter housing assembly 600, having a housing 610 with a substantially cylindrical body 612 and a top portion 614 for forming a fluid-tight seal with the body. The top portion 614 is depicted as substantially dome-shaped to facilitate the filter housing assembly as a pressurized vessel; however, it may be a flat surface if design constraints require. The cylindrical body 612 and housing top portion 614 share a longitudinal axial center line 616. A protrusion 618 extends in the axial direction upwards from top portion 614, and outwards in a radial direction about the axial center 616. Dimensionally, the protrusion 618 extends upwards approximately 0.15-0.35 inches—and preferably 0.24 inches—from the top surface of the housing top portion 614. Housing 610 may hold a filter media therein for the filtration of fluids, may act as a sump, or may act as a bypass filter cartridge having no filtration media. Housing 610 is further adapted to receive a connection assembly 665 which consists of an electronic circuit component 660 and a housing 662 for receiving said electronic circuit component therein. Electronic circuit component 660 is exemplified in FIGS. 12-13 and in the below description as a printed circuit board 660, but other electronic circuit components may be used with the filter housing assembly of the present invention, including but not limited to: microcontrollers, microprocessors, microchips (such as erasable programmable read-only memories (“EPROMs”), or any other type of analog, digital, or mixed signal integrated circuit (“IC”) technology.

Filter housing 600 may include at least one strengthening rib 613 longitudinally located on the filter housing outer surface. Strengthening rib(s) 613 may function as a guide for inserting filter housing assembly 600 into a shroud (not shown) that may be part of the installation assembly for ensuring proper alignment with the filter base. Strengthening rib 613 is preferably integral with filter housing 600, but may also be attachable as a separate component part. As shown in FIG. 12A, for example, rib 613 extends along the length of cylindrical body 612, parallel to axial center line 616.

As shown in FIGS. 12A-12E, an ingress port 620 is demarcated into three distinct segments: a first or top segment 622, a second or middle segment 623, and a third or bottom segment 624. The third or bottom segment 624 extends vertically upwards in a longitudinally axial direction from the surface of housing top portion 614 substantially parallel to the axial center line 616. The ingress port bottom segment 624 is distinguished from middle segment 623 by seal 628. The ingress port top segment 622 extends from the ingress port middle segment 623 upwards to the topmost surface of the port, and is distinguished from middle segment 623 by seal 627. Seals 627 and 628 prohibit fluid exiting ingress port middle segment's aperture or cavity 640 a from contacting the outer surface of the ingress port top and bottom segments 622, 624, respectively, once the ingress port is inserted within a receiving filter base stanchion. Seals 627 and 628 provide a circumferential press-fit or sealing force against the inner cylindrical wall of the stanchions of the filter base (not shown). Seals 627, 628 are held in place on the ingress port typically by insertion into a groove within the ingress port cylindrical outer surface, such that a diameter D1 of the outermost seal radial extension is slightly greater than the inner wall diameter of the receiving stanchion, allowing the resilient, compressible seals to be compressed by the inner wall of the receiving stanchion upon insertion, forming a fluid-tight fit.

In at least one embodiment, ingress port middle segment 623 has a varying diameter D2 unequal to, and less than D1, such that the ingress port middle segment 623 is formed having an outer surface contour to allow for fluid to flow around the middle segment 623 after the ingress port 620 is inserted into its respective stanchion. Ingress fluid from a filter base stanchion fluid port is contained by and between seals 627, 628 and the circumferential stanchion inner wall. The fluid traverses around the ingress port middle segment and enters the ingress port middle segment aperture or cavity 640 a. In this manner, the filter base stanchion fluid port may be located on the opposite side of the middle segment ingress port cavity, that is, facing the middle segment outside wall, one hundred eighty degrees away from the ingress port cavity.

In the embodiment depicted in FIG. 12, the outer surface contour of ingress middle segment 623 is depicted in the form of an hourglass shape having a smaller diameter at its center than at either the topmost or bottommost points of the middle segment closest to the seals 627, 628. The ingress port middle segment's body may be formed of other shapes as well, such as a smaller cylindrical shape having a diameter less than D1, a rectangular or triangular segment, or cone-shaped architecture, wherein the middle segment 623 has at least one area where its measured width or diameter is less than diameter D1, providing an annular space for fluid to flow around the middle segment structure to allow fluid, exiting the filter base input port into the stanchion to enter the ingress port middle segment's aperture or cavity 640 a.

In at least one embodiment, ingress port 620 is substantially cylindrical at its top and bottom segments to correspond to the cylindrical cavity of its respective receiving stanchion. The measurements of the outermost surface contour of ingress port 620 at the seals 627, 628/stanchion inner wall interface, which is identified by diameter D1, may be between 0.25-0.45 inches—and optionally 0.36 inches—while the ingress middle segment diameter D2 of ingress port 620 may be between 0.2-0.4 inches, and optionally 0.28 inches. The middle segment diameter D2 is less than diameter D1 and the diameter of the receiving stanchion to achieve fluid flow about and around the ingress port middle segment from the exit port of the stanchion on one side to the input aperture 640 a of the middle segment to the other side. A fluid seal is still maintained during such instances of fluid flow, such that fluid is prohibited from contacting the outer surface of the ingress port top or bottom segments. This allows for the outer surface contour of ingress middle segment 623 to be less than, and within, the compressed sealing diameter D1 at the filter base's stanchion inner wall. Fluid is allowed to flow around the ingress middle segment, contained by the seals, and prohibited from flowing outside the middle segment.

An egress port 630 similarly having a substantially cylindrical body 631 with a first or top segment 632, a second or middle segment 633, and a third or bottom segment 634, extends vertically upwards in a longitudinally axial direction from the top surface of housing top portion 614 substantially parallel to top portion axial center 616. The egress port top segment 632 extends from its topmost point downwards to the egress port middle segment 633, and is distinguished from middle segment 633 by a seal 638. The egress port bottom segment 634 extends from housing top portion 614 upwards to the egress port middle segment 633, and is distinguished from middle segment 633 by seal 637. Seals 637, 638 prohibit fluid exiting the egress port middle segment 633 aperture or cavity 640 b from contacting the outside surface of egress port top and bottom segments 632, 634, respectively. Seals 637, 638 provide a circumferential press-fit or sealing force against the inner cylindrical wall of the receiving stanchion of the filter base (not shown). Seals 637, 638 are held in place on the egress port typically by insertion within a groove on the egress port outer wall surface, such that a diameter D3 of the outermost seal radial extension is slightly greater than the inner wall diameter of the receiving stanchion allowing the resilient, compressible seals to be compressed by the inner wall of the receiving stanchion upon insertion, forming a fluid-tight fit. In a similar fashion as the ingress port, the egress port middle segment 633 may be formed in other shapes that allow fluid to flow around the middle segment when the middle segment is placed within the receiving filter base stanchion.

In the embodiment depicted in FIG. 12, the outer surface contour of egress middle segment 633 is depicted in the form of an hourglass shape having a smaller diameter D4 at its center than at either the topmost or bottommost points of the middle segment closest the seals 637, 638. The egress port middle segment's body may be formed of other shapes as well, such as a smaller cylindrical shape having a diameter less than D3, a rectangular or triangular segment, or cone-shaped architecture, wherein the middle segment 633 has at least one area where the surface contour width or radial extension remains within the constraints of diameter D3 to allow fluid, exiting egress port middle segment's aperture or cavity 640 b and contained by seals 637, 638 and the circumferential stanchion inner wall, to flow around the egress port middle segment to the opposite side for input into the filter base from an aperture in the receiving stanchion.

The ingress port segments 622-624 and egress port segments 632-634 may each have outer surface contours separate and distinct from one other. In the alternative, ingress port segments 622-624 and egress port segments 632-634 may have substantially similar outer surface topologies. In any case, the respective middle segments will have an outer surface topology (e.g., the outer diameter in a substantially cylindrically shaped embodiment) that has an outer surface contour with a diameter or width that is less than the inner wall of the receiving filter base stanchion by an amount sufficient to create an annular gap that allows fluid to flow around and about the middle segments between their respective upper and lower seals.

The measurements of outermost diameter D3 of egress port 630 at the seal/stanchion inner wall interface may be between 0.25-0.45 inches—and optionally 0.36 inches—while the egress middle segment 633 diameter D4 of egress port 630 may be between 0.2-0.4 inches, and optionally 0.28 inches. The middle segment smaller radial extension D4 is less than diameter D3 to achieve fluid flow about and around the egress port middle segment. This allows for the outer surface contour radial extension of ingress middle segment 623 to be less than the compressed sealing diameter at the manifold's stanchion inner wall.

Ingress port 620 and egress port 630 both include aperture or cavity 640 a,b located on their respective middle segments 623, 633 for the passage of fluid. The ingress port and egress port apertures or cavities 640 a,b are exposed in a direction facing away from the filter base stanchion apertures that are in fluid communication with apertures 640 a,b. The opposing placement of the apertures is helpful because upon extraction of the filter cartridge, if ingress and egress apertures 640 a,b are in a direction facing the filter base stanchion apertures (defined simply as a means of convention as a forward direction), any fluid that drains from apertures 640 a,b may drip upon the electronics and electronic surfaces populated on the electronic circuit component or printed circuit board 660 located forward of the filter key in a PCB housing 662. Once the filter housing 610 is installed in the filter base or manifold, the cavities 640 a,b of the ingress and egress ports are designed to be facing away from the filter base ports (not shown). Water flowing through housing assembly 600 thus enters and exits the cavities 640 a,b, respectively, flows around the middle segments 623, 633 of the ingress and egress ports within the manifold stanchions, and continues into the ports. The variable widths, radial extensions or diameters D2, D4 of the middle segments 623, 633, respectively, allows for the water to flow around the ingress and egress port middle segments within the stanchion's cylindrical cavity without building undue pressure that could otherwise force a leak through the seals 627, 628, 637, 638 and onto the filter housing assembly 600, which would otherwise cause damage to the electronics disposed on the printed circuit board 660 as further described below.

Ingress port and egress port 620, 630 extend from, and are substantially perpendicular to, a non-diameter chord line C1 of the housing top portion 614, as shown in FIG. 12E. Moving the ingress and egress ports off a corresponding parallel diameter of the housing top portion is helpful to allow for sufficient space on the housing top portion 614 for placement of the PC board housing 662 and PC board 660. Dimensionally, the distance between chord line C1 and a parallel diameter of housing top portion 614 may be between 0.1-0.5 inches, and optionally 0.3 inches. The ingress and egress ports are off-diagonal center in order to accommodate the remaining particular features of the housing assembly 600. Ingress port 620 and egress port 630 are spaced apart from each other on chord line C1 by approximately 0.65-0.85 inches, and optionally 0.74 inches. The filter key 650 is centered on, and perpendicularly intersects with, chord line C1.

The filter key 650 structured for mating attachment to a filter base or manifold is located on or connected to the housing 610, and extends upwards in a direction parallel to the axial center 616 of the housing top portion 614. Filter key 650 comprises a base 651 having a front lateral side 652 a, and a rear or back lateral side 652 b, with a groove 654 running therethrough for receiving protrusion 618 on housing top portion 614, and lengthwise or longitudinal sides 653 running substantially parallel to protrusion 618, as shown across FIGS. 13A-13C. Filter key 650 is secured to the housing top portion 614 via the connection between groove 654 and protrusion 618.

Base 651 extends upward along the housing top portion axial center 616, having the exposed front face and back face 652 a, 652 b, respectively, and two exposed longitudinal side faces 653 a,b. A cross-section of the base 651 in a plane parallel to the front and back lateral faces 652 a,b depicts longitudinal sides 653 a,b gradually tapering inward through the upward extension, and then projecting upwards parallel to the central axis to a top surface that supports an attachment member such as finger 655 as discussed further below.

From the top of base 651 extends finger 655 (and in at least one other embodiment, a plurality of extending fingers), the finger 655 extending substantially parallel to the exposed front and back lateral faces or sides 652 a,b, and substantially perpendicular to the housing top portion axial center line 616. Finger(s) 655 further includes on one side a contacting portion 656 forming substantially a first angle and exposed in a first direction with respect to the housing top portion, which presents a camming surface for slidably mating with a filter base drive key. In a second embodiment, an adjacent side 657 is introduced (as depicted in FIG. 13) forming a second angle and exposed in a second direction with respect to the housing top portion, such that the first angle and the second angle are not equal.

Once installed on the housing top portion, the filter key is spaced approximately 0.4-0.6 inches—and optionally 0.53 inches—from either port 620, 630, as measured on the chord line C1 from the closest outer surface point of either port on each side of the filter key. In this manner, the filter key is centered between the ports. The filter key extends frontwards (away from the exposed face of apertures 640 a,b) beyond chord line C1, extending through the center of both ports, such that lengthwise the filter key is not centered about the chord line C1, and extends in one direction (conventionally only, defined as frontwards) further away from the ingress and egress ports than in the opposite direction.

A PCB housing or holder 662 having a recess 663 formed for receiving the printed circuit board 660 is extended frontwards from the filter key base. The PCB housing and recess being attachable to, or preferably integral with, filter key 650, as shown in FIGS. 13A-13C. The printed circuit board 660 may alternatively be connected directly to the filter housing 610, without the need for a PCB housing structure, as exemplified in FIGS. 14A-14D.

The filter key may extend partially within recess 663 as depicted in FIG. 13A. This filter key extended portion 650 a may cause the attaching PC board to be shaped to accommodate the extended portion 650 a, giving the PC board an elongated “horseshoe” shaped footprint around the extended portion. Recess 663 is substantially linear at one end 663 a as shown in FIG. 13A, extending outwards from the filter key base exposed side faces 653 a,b. The opposing side 663 b of recess 663 may be curved as shown. The PCB housing 662 may have a length (from outside wall to outside wall) of approximately 1.47-1.67 inches (optionally 1.57 inches), and a lateral or shorter dimension of approximately 0.63-0.83 inches (optionally 0.73 inches). Recess 663 is depicted with a lengthwise dimension (from inside wall to inside wall) that may have a length at its substantially linear end 663 a of approximately 1.37-1.57 inches (and optionally 1.47 inches), and with a lateral or shorter dimension having a length of approximately 0.52-0.72 inches (and optionally 0.62 inches), such that the recess resembles approximately a rectangular basin with curved corners on the end furthest from the filter key.

PCB housing 662 is connected to, or integral with, the longitudinal sides 653 a,b of the filter key and extends on each side past—and centered about—the filter key exposed side faces 652 a,b respectively. When installed, the PCB housing bottom surface preferably forms to the shape of the housing top portion 614. As the housing top portion 614 is depicted in one embodiment as being domed shaped, the PCB housing bottom surface is concave facing the housing top portion.

The PCB housing sidewalls extend upward from the PCB housing bottom surface such that the top edge of the PCB housing plateaus in a planar surface perpendicular to the housing axial center 616. The PCB housing is designed to receive a relatively straight, flat PC board. Alternatively, the PCB housing may be shaped in a non-plateauing manner to accommodate a printed circuit board that is not shaped as a flat board, and to allow for a proper electrical attachment of the filter housing 610 to a connector on the filter base.

PCB housing may be alternatively designed to extend past the rear lateral exposed back side of the filter key (not shown). In another alternative, PCB housing 662 may be presented as its own distinct piece separate from the filter key 650, to be separately connected to the housing assembly 600 (not shown). In still a further alternative, PCB housing 662 may be integral with the housing 610, either at the top portion 614 or elsewhere on the housing body 612 as manufacturing demands may require.

PCB housing 662 further includes exposed terminal posts 664 disposed therein for mechanically supporting the printed circuit board 660. Other extension features or ledges extending internally from the recess side walls 663 a,b are used to support the PC Board about its periphery.

The PCB includes pads 661 for electrical connection to a connector located on the filter base. The pads 661 are optionally gold plated, and designed for swiping interaction with a corresponding connector terminal (not shown) during the insertion and removal of the filter assembly from its respective base. In an embodiment, the PC board includes four pads (two sets of two pad connectors) for electrical connection. The pads are exposed facing upwards on the PC board, and are preferably rectangular in footprint shape to accommodate tolerances in the filter base connector, especially during the pushing motion for insertion and extraction of the filter cartridge.

In operation, printed circuit board 660 assists a processor in utilizing crypto-authentication elements with protected hardware based key storage (up to 16 keys). Electronic components such as authentication chips, capacitors, resistors, diodes, LED's, and the like, are supported on the bottom side of the PCB, opposite the pads 661. The printed circuit board executes encryption capabilities using secure hash algorithms (“SHA”) with 256 bit key lengths. The circuit board 660 is further capable of housing additional electronics for storing information pertaining to estimated water flow (through the filter housing assembly), and total filter usage time. This information is communicated via a main control board, the main control board being optionally installed on or within a refrigerator, and which further monitors the filter usage time and estimated water flow, among other variables.

In at least one embodiment of the present invention, electrical connection of filter housing assembly 600 to a mating filter base may be achieved using an electrical connector or wire harness assembly such as that of FIGS. 15-18. It should be understood by those skilled in the art that a wire harness assembly as described herein is only one illustrative means of making an electrical connection between the filter housing assembly and a mating filter base according to the present invention, and that other means of making such electrical connection are not precluded.

Referring now to FIGS. 15 and 16, an illustrative wire harness 710 (also referred to as an electrical connector 710) includes a first connector 712, a second connector 714, and wires or conductors 716 extending therebetween. In the embodiment shown, four conductors 716 are provided, but other numbers of conductors 716 can be provided to accommodate the electrical requirements without departing from the scope of the invention. In typical applications, the harness 710 is operatively connected to, positioned at, and/or forms a part of a filter base for mating with a complementary filter housing assembly. Here, in some embodiments, the first connector 712 of the wire harness 710 is operatively coupled (e.g., electrically and mechanically coupled) with a corresponding connection component of a filter base assembly.

Contacts 718 are provided at one end of the conductors 716. The contacts 718 are configured to be inserted into the housing 720 of the first connector 712. While crimped contacts 718 are shown, the contacts 718 are not so limited. In addition, the first connector 712 need not be limited to the type of plug connector shown. In some embodiments, the first connector 712 is connected to the circuitry 910 of an appliance, such as a refrigerator 900 (FIG. 31).

As best shown in FIGS. 16-18, the second connector 714 has resilient contacts 722 provided therein. In the embodiment shown, four contacts 722 are provided so that each of the conductors 716 may be terminated. However, other numbers of contacts 722 may be provided based on the number of conductors 716. The contacts 722 are stamped and formed from material having the appropriate electrical and mechanical characteristics.

The contacts 722 have wire termination sections 724, transition or compliant sections 726, and mating portions or substrate engagement sections 728 for connection to a mating connection surface of a corresponding connection assembly having an electronic circuit component (e.g, circuit pads or connection devices 740 of electronic circuit component 742). The wire termination sections 724 have folded over areas 730 provided proximate the free ends 732. Slots 734 are provided in the folded over areas 730 to form insulation displacement slots which cooperate with the conductors 716 to place the contacts 722 in electrical engagement with the conductors 716.

The transition or compliant sections 726 extend from the wire termination sections 724. In the illustrative embodiment shown, the transition or compliant sections 726 extend at essentially right angles from the wire termination sections 724, although other angles may be used. Embossments 736 extend from the wire termination sections 724 to the transition or compliant sections 726 to provide additional strength and stability between the wire termination sections 724 and the transition or compliant sections 726. The shape, size and positioning of the embossments 736 may be varied depending upon the amount of stiffness or resiliency of the contacts that is desired.

The substrate engagement sections 728 extend from the transition or compliant sections 726. In the illustrative embodiment shown, the substrate engagement sections 728 extend at essentially right angles from the transition or compliant sections 726, although other angles may be used. The substrate engagement sections or mating portions 728 have curved contact sections 738 which are configured to be positioned in mechanical and electrical engagement with circuit pads or connection devices 740 (e.g., of a corresponding connection assembly having an electronic circuit component 742, such as pads 661 of printed circuit board 660 of filter housing assembly 600, as described with respect to FIGS. 12-13). In at least one embodiment, the wire harness 710 is positioned within a water filter base assembly of an appliance, such as a refrigerator. Here, the wire harness 710 may be positioned within a filter base that is configured to receive a corresponding mating filter housing or cartridge assembly (e.g., a water filter cartridge). In such embodiment, the wire harness 710 may be employed to establish an electrical connection between the circuitry of the refrigerator and the connection assembly of the filter cartridge (e.g., a water filter cartridge). Embossments 744 are provided on the curved contact sections 738 to provide additional strength and stability to the curved contact sections 738. The shape, size and positioning of the embossments 744 may be varied depending upon the amount of stiffness or resiliency of the contacts that is desired.

The connector housing 746 of the second connector 714 has an upper surface 748 and an oppositely facing lower surface 750. Contact-receiving enclosures 752 extend from the upper surface 748 in a direction away from the lower surface 750. In the embodiment shown, four contact-receiving enclosures 752 are provided so that each of the contacts 722 may be positioned in a contact-receiving enclosure 752. However, other numbers of contact-receiving enclosures 752 may be provided based on the number of contacts 722 and conductors 716. The contact-receiving enclosures 752 are dimensioned to receive the free ends 732 of the contacts 722 and a portion of the folded over areas 730 of the wire termination sections 724 therein.

Conductor-receiving conduits 754 are provided between the upper surface 748 and the lower surface 750. The conductor-receiving conduits 754 are dimensioned to receive a portion of the conductors 716 therein. The conductor-receiving conduits 754 are provided in-line with the contact-receiving enclosures 752 such that the conductors 716 positioned in the conductor-receiving conduits 754 extend through the contact-receiving enclosures 752.

Contact-receiving projections 756 extend from the lower surface 750 in a direction away from the upper surface 748. In the embodiment shown, four contact-receiving projections 756 are provided so that each of the contacts 722 may be positioned in a contact-receiving projection 756. However, other numbers of contact-receiving projections 756 may be provided based on the number of contacts 722 and conductors 716. Slots 758 are provided in the contact-receiving projections 56. The slots 758 are dimensioned to receive and retain a portion of the folded over areas 30 of the wire termination sections 724 therein.

During assembly of the second electrical connector 714 and the wire harness 710, the conductors 716 are inserted in the conductor-receiving conduits 754, such that ends of the conductors 716 extend in the conductor-receiving conduits 754 past the contact-receiving enclosures 752.

With the conductors 716 fully inserted, the contacts 722 are inserted into the connector housing 746 from the bottom surface 750. The folded over areas 730 of the wire termination sections 724 are inserted into the slots 758 of the contact-receiving projections 756. As the insertion of the contacts 722 continues, the slots 734 of the folded over areas 730 of the wire termination sections 724 engage the conductors 716 positioned in the conductor-receiving conduits 754, causing the insulation of the conductors 716 to be displaced, as is known for insulation displacement type contacts, and providing a mechanical and electrical connection between the contacts 722 and the conductors 716.

With the wire termination sections 724 properly positioned in the slots 758 of the contact-receiving projections 756, the wire termination sections 724 are maintained in position by barbs, interference fit, or other known means.

With the contacts 722 properly secured to the conductors 716 and the housing 746 of the electrical connector 714, the electronic circuit component 742, such as printed circuit board 660, is moved into engagement with the curved sections 738 of the substrate engagement sections 728 of the contacts 722. As this occurs, the resilient contacts 722 flex (e.g., compress, deform, or the like) from one position to another, such that the curved sections 738 of the substrate engagement sections 728 of the contacts 722 exert a force on the mating connection surfaces or circuit pads 740 (also referred to as one or more connection devices 740) of the electronic circuit component 742 (e.g., circuit pads 661 of printed circuit board 660) to retain the contacts 722 in mechanical and electrical engagement with the circuit pads 740.

When mating between the electronic circuit component 742 and the contacts 722 occurs, the movement of the electronic circuit component 742 (e.g., printed circuit board 660) toward the electrical connector 714 causes the contacts 722 to resiliently deform or deflect by 4 mm or more to provide a sufficient mating force between the contacts 722 and the circuit pads 740. As the resilient deflection of the contacts 722 occurs, the wire termination sections 724 remains in a fixed position in the slots 758 of the contact-receiving projections 756. The substrate engagement sections 728 are moved in a direction which is essentially parallel to the longitudinal axis of the contacts 722, causing the transition or compliant sections 726 to pivot about the points where the transition or compliant sections 726 engage the wire termination sections 724. The rigidity of the points where the transition or compliant sections 726 engage the wire termination sections 724 and the rigidity of the embossments 736 determine the mating force applied by the contacts 722 to the circuit pads 740.

After mating of the circuit pads 740 to the contacts 722 occurs, the electrical connector 714 and the electronic circuit component 742 (e.g., printed circuit board 660) are maintained in position by latches or other means to prevent the unwanted withdraw of the circuit pads 740 from the contacts 722.

Referring now to FIGS. 19 through 21, a second illustrative wire harness 7110 (also referred to as an electrical connector 7110) includes a first connector 7112, a second connector 7114 and wires or conductors 7116 extending therebetween. In the embodiment shown, four conductors 7116 are provided, but other number of conductors 7116 can be provided to accommodate the electrical requirements without departing from the scope of the invention.

Contacts 7118 are provided at one end of the conductors 7116. The contacts 7118 are configured to be inserted into the housing 7120 of the first connector 7112. While crimped contacts 7118 are shown, the contacts 7118 are not so limited. In addition, the first connector 7112 is not limited to the type of plug connector shown. In some embodiments, the first connector 7112 is connected to the circuitry of an appliance (e.g., a refrigerator).

As best shown in FIGS. 19 and 20, the second connector 7114 has resilient contacts 7122 provided therein. In the embodiment shown, four contacts 7122 are provided so that each of the conductors 7116 may be terminated. However, other numbers of contacts 7122 may be provided based on the number of conductors 7116. The contacts 7122 are stamped and formed from material having the appropriate electrical and mechanical characteristics.

The contacts 7122 have housing termination sections 7124, transition or compliant sections 7126 and mating portions or substrate engagement sections 7128 for connection to a mating connection surface of a corresponding connection assembly having an electronic circuit component (e.g, circuit pads or connection devices 7140 of electronic circuit component 7142). The housing termination sections 7124 have housing engagement members 7130 which extend from vertical members 7132. Mounting openings 7134 (FIG. 21) are provided in the housing engagement members 7130. In the illustrative embodiment shown, the housing engagement members 7130 extend at essentially right angles from the vertical members 7132, although other angles may be used. Embossments 7136 extend from the housing engagement members 7130 to the vertical members 7132 to provide additional strength and stability. The shape, size and positioning of the embossments 7136 may be varied depending upon the amount of stiffness or resiliency of the contacts that is desired.

The transition or compliant sections 7126 extend from the housing termination sections 7124. In the illustrative embodiment shown, the transition or compliant sections 7126 extend at essentially right angles from the housing termination sections 7124, although other angles may be used.

The substrate engagement sections 7128 extend from the transition or compliant sections 7126. In the illustrative embodiment shown, the substrate engagement sections 7128 extend at essentially right angles from the transition or compliant sections 7126, although other angles may be used. The substrate engagement sections 7128 or mating portions have curved contact sections 7138 which are configured to be positioned in mechanical and electrical engagement with circuit pads 7140 of a mating electronic circuit component 7142 (FIG. 19), such as pads 661 of printed circuit board 660 as shown in FIGS. 12-14. Embossments 7144 are provided on the curved contact sections 7138 to provide additional strength and stability between the curved contact sections 7138. The shape, size and positioning of the embossments 7144 may be varied depending upon the amount of stiffness or resiliency of the contacts that is desired.

The connector housing 7146 of the second connector 7114 has an upper surface 7148 and an oppositely facing lower surface 7150. As best shown in FIG. 21, openings 7152 extend from the upper surface 7148 to the lower surface 7150. In the embodiment shown, four openings 7152 are provided, however other numbers of openings 7152 may be provided based on the number of contacts 7122 and conductors 7116. The openings 7152 are dimensioned to receive the mounting hardware 7154 therein.

Ring contacts 7156 are provided at the ends of the conductors 7116. The ring contacts 7156 are provided in-line with the openings 7152. The ring contacts 7156 have openings 7158 to receive the mounting hardware 7154 therein.

During assembly of the second electrical connector 7114 and the wire harness 7110, the openings 7158 of the ring contacts 7156 of the conductors 7116 are positioned in line with the openings 7152. The mounting openings 7134 of the contacts 7122 are also positioned in line with the openings 7152. The mounting hardware 7154 is inserted through the openings 7158, the openings 7152 and the openings 7134 to secure the conductors 7116 and the contacts 7122 to the connector housing 7146. The mounting hardware 7154 also provides the electrical connection between the ring contacts 7156 of the conductors 7116 and the contacts 7122.

With the contacts 7122 properly secured to the housing 7146 of the electrical connector 7114, the printed circuit board 7142 is moved into engagement with the curved sections 7138 of the substrate engagement sections 7128 of the contacts 7122. As this occurs, the resilient contacts 7122 flex (e.g., compress or deform) from one position to another, such that the curved sections 7138 of the substrate engagement sections 7128 of the contacts 7122 exert a force on the mating connection surfaces or circuit pads 7140 of the electronic circuit component or printed circuit board 7142 to retain the contacts 7122 in mechanical and electrical engagement with the circuit pads 7140.

When mating between the printed circuit board 7142 and the contacts 7122 occurs, the movement of the electronic circuit component 7142 toward the electrical connector 7114 causes the contacts 7122 to resiliently deform or deflect by 4 mm or more to provide a sufficient mating force between the contacts 7122 and the circuit pads 7140. As the resilient deflection of the contacts 7122 occur, the housing engagement members 7130 and the vertical members 7132 of the housing termination sections 7124 remains in a fixed position. The substrate engagement sections 7128 are moved in a direction which is essentially parallel to the longitudinal axis of the contacts 7122, causing the transition or compliant sections 7126 to pivot about the points where the transition or compliant sections 7126 engage the vertical members 7132. The rigidity of the points where the transition or compliant sections 7126 engage the vertical members 7132 determine the mating force applied by the contacts 7122 to the circuit pads 7140.

After mating of the circuit pads 7140 to the contacts 7122 occurs, the electrical connector 7114 and the circuit board 7142 are maintained in position by latches or other means to prevent the unwanted withdraw of the circuit pads 7140 from the contacts 7122.

FIG. 22 depicts another embodiment of a filter base assembly in accordance with the present invention, which is adapted to operatively connect to a wire harness assembly for making an electrical connection between the filter base and a complementary mating filter housing assembly, such as filter housing assembly 600. Filter base 1000 includes a base platform 1010 having an enclosure 1011 for holding a locking member such as floating or sliding lock 1012 in place while allowing it to freely move in a direction perpendicular to the axial extensions of the stanchions 1001 a,b, off its center position and back to its center position during the insertion and extraction of a mating filter housing assembly, such as filter housing assembly 600. Stanchions 1001 a,b are disposed on either side of enclosure 1011 for receiving ingress and egress ports of a mating filter housing. In one or more embodiments, floating lock 1012 may be structurally identical to floating lock 12, as described above with respect to FIGS. 3A-3E. In other embodiments, enclosure 1011 may also hold floating lock 1200 and floating lock 1212 of FIG. 8. For simplicity, reference is made chiefly to the interaction of enclosure 1011 with floating lock 1012 (e.g., locking member or floating lock 12), although it should be understood by those skilled in the art that the applicability of enclosure 1011 includes usage with floating lock 1200 and 1212 as well. Enclosure 1011 includes a protruding encasement 1002, larger than floating lock 1012, and made to enclose floating lock 1012 therein. Encasement 1002 prevents over-travel of floating lock 1012, and protects it when installed from extraneous, unintended movement.

Ingress/egress stanchions 1001 a,b are located on opposite sides of encasement 1002 on laterally-extending portions 1013 of base platform enclosure 1011, that is, the portions of enclosure 1011 that run perpendicular to the longer or longitudinal sides of enclosure 1011. Ports 1003 a,b represent the ingress and egress ports for the fluid and extend along parallel axes to stanchions 1001 a,b, respectively, and are connected to the water lines of the refrigerator. Shut-off stanchions 1001 a,b include shutoff plugs (not shown), which act as valve seals to stop fluid flow when the filter cartridge is being removed. Shut-off stanchions 1001 a,b are preferably cylindrical in shape, containing spring activated, O-ring sealed plugs for sealing the ingress and egress lines during filter cartridge removal. In an embodiment, as shown in FIGS. 22 and 27, base platform 1010 is formed integrally with stanchions 1001 a,b, which are disposed on either longitudinal side of base platform enclosure 1011 and offset from a midpoint of the length of enclosure 1011 in the direction of one end thereof. Each ingress/egress stanchion 1001 a,b has an upper stanchion portion 1004 a,b extending perpendicularly upwards with respect to a top surface of base platform 1010 in an axial direction and a lower stanchion portion 1005 a,b extending downwards with respect to base platform 1010 in the axial direction. In at least one embodiment, stanchions 1001 a,b may be spaced apart from each other by approximately 0.65-0.85 inches, and optionally 0.74 inches, to accommodate insertion of ingress and egress ports of a mating filter housing assembly, such as ingress and egress ports 620, 630 of filter housing assembly 600. Enclosure 1011 includes curved portions shaped to go around shut-off stanchions 1001 a,b and further includes a center aperture 1031 that allows for longitudinal movement (parallel to the longitudinal sides) of locking member or floating lock 1012. As best seen in FIG. 22A, floating lock 1012 may include an extension member 1080 opposite the face configured with extended attachment members or fingers and gaps (FIG. 22), in order to permit resilient components, such as helical or torsion springs to act upon it. In these embodiments, the extension member 1080 is acted upon by resilient devices held within spring housing 1090, as shown in FIG. 22A. In an embodiment, spring housing 1090 is preferably attached by snap fit to filter base 1000, although other attachment schemes known in the art may be easily employed, such as bonding, welding, and assorted mechanical fasteners.

Referring now to FIGS. 23-24, a wire harness 810 (also referred to as an electrical connector 810) for mechanical connection with filter base 1000 is shown. Wire harness 810 includes a first connector 812, a second connector 814 and wires or conductors 816 extending therebetween. In the embodiment shown, four conductors 816 are provided, but other numbers of conductors 816 can be provided to accommodate the electrical requirements without departing from the scope of the invention. In typical applications, the harness 810 is operatively connected to, positioned at, and/or forms a part of a filter base for mating with a complementary filter housing assembly (e.g., as shown in FIGS. 25 through 29 and described in more detail below). Here, and in at least some other embodiments of the present invention, the first connector 812 of the wire harness 810 is operatively coupled (e.g., electrically and mechanically coupled) with a corresponding connection component of filter base 1000.

Contacts (not shown) are provided at a first end of the conductors 816. The contacts are configured to be inserted into the housing 820 of the first connector 812, and may be crimped in a similar manner to contacts 718 and 7118, as shown in FIGS. 17 and 21, respectively; however it should be understood by those skilled in the art that the contacts are not so limited. In addition, the first connector 812 is not limited to the type of plug connector shown. In one or more embodiments, the first connector 812 is connected to the circuitry of an appliance, such as a refrigerator.

The second connector 814 has resilient contacts 822 provided therein. In the embodiment shown, four contacts 822 are provided so that each of the conductors 816 may be terminated. However, other numbers of contacts 822 may be provided based on the number of conductors 816. The contacts 822 are stamped and formed from material having the appropriate electrical and mechanical characteristics.

The contacts 822 have wire termination sections 824, transition or compliant sections 826 and substrate engagement sections 828 or mating portions for connection to a mating connection surface of a corresponding connection assembly having an electronic circuit component (e.g, circuit pads 661 of printed circuit board 660 of filter housing assembly 600). The wire termination sections 824 may have folded over areas provided proximate the free ends (not shown). Slots may be provided in the folded over areas to form insulation displacement slots which cooperate with the conductors 816 to place the contacts 822 in electrical engagement with the conductors 816. In one or more embodiments, the free ends of contacts 822 may be configured in a similar manner to contacts 722, with folded over areas 730 proximate free ends 732 and including slots 734 therein, as shown in FIG. 18; however it should be understood by those skilled in the art that the configuration of contacts 822 is not so limited.

The transition or compliant sections 826 extend from the wire termination sections 824. In the illustrative embodiment shown, the transition or compliant sections 826 extend at obtuse angles from the wire termination sections 824, although other angles may be used, such as essentially right angles. Embossments 836 may extend from the wire termination sections 824 to the transition or compliant sections 826 to provide additional strength and stability between the wire termination sections 824 and the transition or compliant sections 826. The shape, size and positioning of the embossments 836 may be varied depending upon the amount of stiffness or resiliency of the contacts that is desired.

The substrate engagement sections 828 extend from the transition or compliant sections 826. In the illustrative embodiment shown, the substrate engagement sections 828 extend upwardly at essentially right angles from the transition or compliant sections 826, although other angles may be used. The substrate engagement sections or mating portions 828 have curved contact sections 838 which are configured to be positioned in mechanical and electrical engagement with circuit pads or connection devices of a corresponding connection assembly having an electronic circuit component, such as circuit pads 661 of printed circuit board 660 of filter housing assembly 600, as described with respect to FIGS. 12-14. In a particular embodiment, the wire harness 810 is positioned within a water filter base assembly of an appliance. In some embodiments, the appliance is a refrigerator. Here, the wire harness 810 is positioned within filter base 1000 configured to receive a corresponding mating filter housing or cartridge assembly (e.g., a water filter cartridge). In such embodiment, the wire harness 810 may be employed to establish an electrical connection between the circuitry of the refrigerator and the connection assembly of the filter cartridge (e.g., a water filter cartridge). In one or more embodiments, embossments may be provided on the curved contact sections 838 to provide additional strength and stability to the curved contact sections 838. The shape, size, and positioning of the embossments may be varied depending upon the amount of stiffness or resiliency of the contacts that is desired.

The connector housing 846 of the second connector 814 has an upper surface 848 and an oppositely facing lower surface 850 comprising substantially planar extended portions 849, 851 separated by a gapped recess 847 for accommodating a portion of base platform encasement 1002 and floating lock 1012 disposed therebetween (FIG. 27). Extensions 849, 851 are connected by a midportion 853 such that connector housing 846 forms a substantially “U”-shaped member for at least partially surrounding encasement 1002 and floating lock 1012. Midportion 853 includes a slot 855 for receiving resilient tongue 1070 of housing 1090 therein for securing connector housing 846 to filter base 1000, as shown, for example, in FIGS. 25-26. Connector housing 846 is preferably attached by snap fit to enclosure 1011 by inserting at least a portion of housing extended portions 849, 851 into laterally-extending slotted portions 1020 a and 1020 b, respectively, of base platform 1010 (FIG. 22) to allow tongue 1070 to be received, such as by snap-fit, in connector housing slot 855, although other attachment schemes known in the art may be easily employed, such as bonding, welding, and assorted mechanical fasteners.

Contact-receiving enclosures 852 positioned on or integral with each of planar extensions 849, 851 extend from the connector housing upper surface 848 in a direction away from the lower surface 850. In the embodiment shown, four contact-receiving enclosures 852 are provided so that each of the contacts 822 may be positioned in a contact-receiving enclosure 852. However, other numbers of contact-receiving enclosures 852 may be provided based on the number of contacts 822 and conductors 816. The contact-receiving enclosures 852 are dimensioned to receive the free ends of the contacts 822 and a portion of the wire termination sections 824 therein.

Conductor-receiving conduits 854 are provided integral with upper surface 848 and the lower surface 850. The conductor-receiving conduits 854 are dimensioned to receive a portion of the conductors 816 therein. The conductor-receiving conduits 854 are provided in-line with the contact-receiving enclosures 852 such that the conductors 816 positioned in the conductor-receiving conduits 854 extend through the contact-receiving enclosures 852.

Contact-receiving projections 856 extend from the connector housing lower surface 850 in a direction away from the upper surface 848. In the embodiment shown, four contact-receiving projections 856 are provided so that each of the contacts 822 may be positioned in a contact-receiving projection 856. However, other numbers of contact-receiving projections 856 may be provided based on the number of contacts 822 and conductors 816. Slots 858 are provided in the contact-receiving projections 856. The slots 858 are dimensioned to receive and retain a portion of the wire termination sections 824 therein.

During assembly of the second electrical connector 814 and the wire harness 810, the conductors 816 are inserted in the conductor-receiving conduits 854, such that ends of the conductors 816 extend in the conductor-receiving conduits 854 past the contact-receiving enclosures 852.

With the conductors 816 fully inserted, the contacts 822 are inserted into the connector housing 846 from the bottom surface 850. A portion of the wire termination sections 824 are inserted into the slots 858 of the contact-receiving projections 856. As the insertion of the contacts 822 continues, the wire termination sections 824 engage the conductors 816 positioned in the conductor-receiving conduits 854, causing the insulation of the conductors 816 to be displaced, as is known for insulation displacement type contacts, and providing a mechanical and electrical connection between the contacts 822 and the conductors 816.

With the wire termination sections 824 properly positioned in the slots 858 of the contact-receiving projections 856, the wire termination sections 824 are maintained in position by barbs, interference fit, or other known means.

Referring now to FIGS. 28-29, filter base 1000 with electrical connector or wire harness 810 is shown connected to a corresponding mating filter housing assembly 600. In one or more embodiments, the interaction between filter key 650 of filter housing assembly 600 and floating lock 1012 is identical to that described above with respect to the interaction between filter key 5 and floating lock 12, for example. Filter key 650 includes at least one finger or extended attachment member used to mate with, or interlock with, corresponding protrusions or drive keys 1023 a,b located on longitudinal sides of floating lock 1012, such that when filter key 650 is inserted to mate with floating lock 1012, the filter key attachment member slidably contacts the drive keys to shift floating lock 1012 longitudinally off its initial position an incremental amount to allow the filter key finger to traverse between gaps on floating lock 1012. Once the fingers have passed between the corresponding gaps on floating lock 1012, which is slidably restrained under tensional forces, floating lock 1012 is partially returned towards its original position by the tensional retraction forces so that the filter key finger aligns or interlocks with at least one protrusion or drive key on floating lock 1012, and the alignment resists any direct outward, axial extraction forces.

In at least one embodiment, as shown in FIG. 30, locking member or floating lock 1012 may include at least one drive key 1024, and preferably a pair of opposing drive keys 1024 a and 1024 b, which is shaped differently from the remaining drive keys 1023 a,b to facilitate interlocking or latching between filter key 650 and floating lock 1012, such as if the filter housing is inserted into the filter base too slowly or with insufficient axial insertion force. As best seen in FIG. 30A, drive key 1024 includes a receiving wedge 1029 having an extended shelf portion 1030 (as compared to drive keys 1023 a,b) to capture the attachment members or fingers of the filter key, opposite slanted edge 1021. As shown in FIG. 30, drive keys 1024 a, 1024 b are positioned at one end of floating lock 1012, with spaced protrusions or drive keys 1023 a,b forming the remainder of the longitudinal sides of the lock; however, it should be understood by those skilled in the art that in other embodiments, any of drive keys 1023 a,b may instead be replaced with drive keys 1024 without negatively impacting the intended interlocking functionality. Upon insertion, when fingers of the filter key contact drive keys 123 a,b, and 1024, floating lock 1012 shifts away from its initial position, against retraction forces, and moves according to the contacting angled portions or edges 58 and 1021. Once the wings of the filter key's fingers clear lip 1027 of the drive keys, floating lock 1012 is not prohibited from reacting to the retraction forces, and moves slightly back, towards its original position where the diamond shaped wings are then trapped by receiving wedges 1029. This position locks filter key 650 to floating lock 1012 resisting any direct axial extraction force.

For simplicity, a further detailed description of the interaction between filter key 650 and lock 1012 will not be repeated herein; however, it should be understood by those skilled in the art that the releasably-securable locking mechanism of this embodiment of the present invention functions in an otherwise similar manner as that described above with respect to filter key 5 and slidable lock 12, for example.

The electrical connection between wire harness 810 and printed circuit board 660 will now be described. With the contacts 822 properly secured to the conductors 816 and the housing 846 of the electrical connector 814, as filter housing assembly 600 is inserted into filter base 1000, printed circuit board 660 is moved into engagement with the curved contact sections 838 of the substrate engagement sections 828 of the contacts 822 of wire harness 810. As this occurs, the resilient contacts 822 flex (e.g., compress, deform, or the like) from one position to another, such that the curved sections 838 of the substrate engagement sections 828 of the contacts 822 exert a force on the mating connection surfaces or circuit pads 661 of printed circuit board 660 to retain the contacts 822 in mechanical and electrical engagement with the circuit pads 661.

When mating between the printed circuit board 660 and the contacts 822 occurs, the movement of the printed circuit board 660 toward the electrical connector 814 causes the contacts 822 to resiliently deform or deflect by 4 mm or more to provide a sufficient mating force between the contacts 822 and the circuit pads 661. As the resilient deflection of the contacts 822 occurs, the wire termination sections 824 remains in a fixed position in the slots 858 of the contact-receiving projections 856. The substrate engagement sections 828 are moved in a direction which is essentially parallel to the longitudinal axis of the contacts 822, causing the transition or compliant sections 826 to pivot about the points where the transition or compliant sections 826 engage the wire termination sections 824. The rigidity of the points where the transition or compliant sections 826 engage the wire termination sections 824 and the rigidity of the embossments 836 determine the mating force applied by the contacts 822 to the circuit pads 661.

After mating of the circuit pads 661 to the contacts 822 occurs, the electrical connector 814 and the printed circuit board 660 are maintained in position by latches or other means to prevent the unwanted withdrawal of the circuit pads 661 from the contacts 822.

In a particular embodiment, an appliance (e.g., a refrigerator) may include a wire harness assembly as described herein, and the wire harness may be connected to the circuitry of the appliance. In the instances where the appliance is a refrigerator, the wire harness may be part of a refrigerator manifold that is configured to receive a water filter. In this regard, the electrical connection component or printed circuit board may be located on the exterior of the water filter and connected to the circuitry of the water filter. When the water filter is inserted into the manifold, the wire harness engages the printed circuit board in order to establish an electrical connection between the circuitry of the refrigerator and the circuitry of the water filter.

In one or more embodiments, the electrical communication between contacts 822 and printed circuit board 660 may be used as part of an electronic authentication system for a filter housing or cartridge assembly, such as filter housing assembly 600. In such embodiments, the filter housing of the filter cartridge may further include a memory device embedded therein, such as a microchip or an integrated circuit, which includes a unique identifier associated with the filter cartridge, such that circuitry associated with the filter base may be used to determine, based on the unique identifier, whether the filter cartridge is a valid or authentic OEM (Original Engineering Manufacturer) filter cartridge by electronic authentication, or for determining other criteria associated with the filter cartridge, such as whether the filter media in a replaceable filter cartridge has reached the end of its useful life.

It is envisioned that embodiments of the present invention may be disposed in a refrigerator 900 (e.g., within the refrigerator cabinet 914), as shown in FIG. 31. The output of the filter assembly may be selectively coupled to a water dispenser or an ice dispenser 950. The water source to the refrigerator would be in fluid communication with filter base 100 or filter base 1000, and prohibited from flowing when filter housing assembly 200 or 600 is removed from filter base 100, 1000. Shutoff plugs in stanchions 1101 a,b or 1001 a,b seal fluid flow until filter housing assembly 200, 600 is inserted in filter base 100, 1000. Upon insertion, fluid would flow to the filter housing assembly and filter water would be returned from the filter housing assembly.

All parts of the filter housing assembly 200, 600 and filter base 100, 1000 may be made using molded plastic parts according to processes known in the art. The filter media may be made from known filter materials such as carbon, activated carbons, malodorous carbon, porous ceramics and the like. The filter media, which may be employed in the filter housing of the instant invention, includes a wide variety of filter media capable of reducing one or more harmful contaminants from water entering the filter housing apparatus. Representative of the filter media employable in the filter housing include those found in U.S. Pat. Nos. 6,872,311, 6,835,311, 6,797,167, 6,630,016, 5,331,037, and 5,147,722. In addition, the filter composition disclosed in the following Published Applications may be employed as the filter media: US 2005/0051487 and US 2005/0011827.

The filter assembly is preferably mounted on a surface in proximity to a source of water. The mounting means are also preferably in close proximity to the use of the filtered water produced by the filter housing apparatus.

While the present invention has been particularly described, in conjunction with specific embodiments, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. It is therefore contemplated that the appended claims will embrace any such alternatives, modifications and variations as falling within the true scope and spirit of the present invention. 

The invention claimed is:
 1. A filter base for receiving a complementary mating filter housing assembly, said filter base comprising: a base platform having fluid ingress and egress stanchions oriented for receiving axially-extending fluid ingress and egress ports of said complementary mating filter housing assembly, said fluid ingress and egress stanchions located on opposite sides of a formed enclosure disposed therebetween for receiving a locking member and having longitudinal sides and lateral sides, said formed enclosure having a length extending in a direction perpendicular to said lateral sides, said fluid ingress and egress stanchions offset from a midpoint of said length in the direction of an end of said formed enclosure; and a wire harness assembly for establishing an electrical connection between said filter base and said complementary mating filter housing assembly, said wire harness assembly including: a first connector; a second connector; conductors extending between said first and second connectors; one or more contacts provided on said second connector, said one or more contacts being flexible from a first position to a second position when a mating portion of said one or more contacts engages a mating connection surface of said complementary mating filter housing assembly; and a connector housing integral with or connected to said base platform, said connector housing being partially disposed within laterally-extending slotted portions of said base platform, said laterally-extending portions extending outwardly from said formed enclosure longitudinal sides, said connector housing having an upper surface and an oppositely facing lower surface and dimensioned to receive a first end portion of the one or more contacts.
 2. The filter base of claim 1 wherein said one or more contacts have termination sections mounted on the second connector at said first end portion, compliant sections extending from said termination sections, and substrate engagement sections extending from said compliant sections, and wherein said one or more contacts mating portions comprise said substrate engagements sections.
 3. The filter base of claim 2 wherein said one or more contacts termination sections have folded over areas proximate free ends forming insulation displacement slots cooperating with said conductors extending between said first and second connectors.
 4. The filter base of claim 3 further including contact-receiving projections extending from said connector housing lower surface, said contact-receiving projections including slots dimensioned to receive and retain a portion of the folded over areas of the termination sections of the one or more contacts therein.
 5. The filter base of claim 1 further including conductor-receiving conduits integral with said connector housing upper and lower surfaces, said conductor-receiving conduits dimensioned to receive a portion of said conductors extending between said first and second connectors, wherein said conductors positioned in the conductor-receiving conduits extend through contact-receiving enclosures of said connector housing.
 6. The filter base of claim 1 wherein said mating connection surface is a circuit pad of a printed circuit board of said complementary mating filter housing assembly, and wherein said one or more contacts mating portions have curved contact sections configured to be positioned in mechanical and electrical engagement with said circuit pads when said complementary mating filter housing assembly is received within said filter base.
 7. The filter base of claim 1 wherein said connector housing includes substantially planar extended portions separated by a gapped recess for accommodating at least a portion of said formed enclosure in said filter base platform, and wherein said connector housing extended portions are at least partially disposed within laterally-extending slotted portions of said base platform.
 8. The filter base of claim 7 wherein said connector housing extended portions are connected by a midportion having a slot for receiving a resilient tongue therein, said resilient tongue extending perpendicularly from a spring housing including at least one resilient member in contact with a locking member of said filter base to provide a retraction force when said locking member is acted upon by said complementary mating filter housing assembly during insertion or extraction of said filter housing assembly from said filter base.
 9. The filter base of claim 8 wherein said spring housing resilient tongue is received within said connector housing midportion slot by snap fit to connect said spring housing to said connector housing.
 10. The filter base of claim 1 wherein said fluid ingress and egress stanchions are connected to or integral with laterally-extending portions of said base platform.
 11. The filter base of claim 7 wherein said fluid ingress and egress stanchions are connected to or integral with laterally-extending portions of said base platform and at least a portion of said formed enclosure extends longitudinally between said ingress and egress stanchions.
 12. The filter base of claim 1 further including ingress and egress ports extending along parallel axes to said ingress and egress stanchions.
 13. A combination filter base and filter housing assembly, said combination comprising: said filter base, said filter base including a base platform having fluid ingress and egress stanchions oriented for receiving axially-extending fluid ingress and egress ports of said complementary mating filter housing assembly, said fluid ingress and egress stanchions located on opposite sides of a formed enclosure disposed therebetween for receiving a locking member and having longitudinal sides and lateral sides, said formed enclosure having a length extending in a direction perpendicular to said lateral sides, said fluid ingress and egress stanchions offset from a midpoint of said length in the direction of an end of said formed enclosure; a wire harness assembly for establishing an electrical connection between said filter base and said filter housing assembly, said wire harness assembly including: a first connector; a second connector; conductors extending between said first and second connectors; one or more contacts provided on said second connector, said one or more contacts being flexible from a first position to a second position when curved contact sections of said one or more contacts engage a mating connection surface of said filter housing assembly; and a connector housing integral with or connected to said base platform, said connector housing being partially disposed within laterally-extending slotted portions of said base platform, said laterally-extending portions extending outwardly from said formed enclosure longitudinal sides, said connector housing having an upper surface and an oppositely facing lower surface and dimensioned to receive a first end portion of the one or more contacts; and said filter housing assembly, said filter housing assembly comprising a filter housing for enclosing a filter media, said filter housing having a body and a top portion for forming a fluid-tight seal with said body, said filter housing top portion including said mating connection surface for engaging said one or more contacts curved contact sections to establish an electrical connection between said filter base and said filter housing assembly, said mating connection surface structured to be in mechanical and electrical engagement with said curved contact sections of said one or more contacts when said filter housing is received within said filter base.
 14. The combination according to claim 13 wherein said one or more contacts have termination sections mounted on the second connector at said first end portion, compliant sections extending from said termination sections, and substrate engagement sections extending from said compliant sections, and wherein said one or more contacts curved contact sections comprise said substrate engagements sections.
 15. The combination according to claim 13 wherein said mating connection surface is a circuit pad of a printed circuit board located on or connected to said filter housing top portion.
 16. The combination according to claim 15 further comprising a printed circuit board housing located on or connected to said filter housing top portion, said printed circuit board housing including a recess for receiving said printed circuit board therein and for connecting said printed circuit board to said filter housing top portion.
 17. The combination according to claim 13 wherein said filter housing further comprises a memory device configured to store a unique identifier associated with said filter housing assembly.
 18. The combination according to claim 17 wherein said memory device comprises a microchip or an integrated circuit.
 19. The combination according to claim 17 wherein said filter housing comprises an electronic circuit component that electrically connects said filter housing top portion mating connection surface to said memory device.
 20. The combination according to claim 17 wherein said filter housing includes a recess enclosing the memory device.
 21. The combination according to claim 13 wherein said filter housing top portion includes ingress and egress ports positioned along a chord line that does not intersect an axial center of said filter housing top portion, such that a diameter line extending perpendicularly through said chord line is dissected in unequal parts, said ingress and egress ports received within said ingress and egress stanchions of said filter base.
 22. The combination according to claim 21 wherein said filter housing top portion ingress and egress ports each extend vertically upwards from said filter housing top portion in a direction parallel to said axial center, wherein each of said ingress port and egress port have at least one portion or segment approximately cylindrical in cross-section, including a first segment forming a top portion of said ingress port and egress port, a third segment adjacent said filter housing top portion, and a second segment located between said first and third segments having at least one aperture or cavity for fluid flow, the first segment and third segment having a first diameter, and the second segment having a second diameter unequal to said first diameter.
 23. The combination according to claim 22 wherein said ingress port and egress port second segments are formed in an hourglass shape.
 24. The combination according to claim 22 wherein said ingress port second segment cavity and said egress port second segment cavity are exposed in a direction opposite said filter housing top portion mating connection surface.
 25. The combination according to claim 13 wherein said connector housing includes substantially planar extended portions separated by a gapped recess for accommodating at least a portion of said formed enclosure in said filter base platform, and wherein said connector housing extended portions are at least partially disposed within laterally-extending slotted portions of said base platform.
 26. The combination according to claim 25 wherein said connector housing extended portions are connected by a midportion having a slot for receiving a resilient tongue therein, said resilient tongue extending perpendicularly from a spring housing including at least one resilient member in contact with a locking member of said filter base to provide a retraction force when said locking member is acted upon by said filter housing assembly during insertion or extraction of said filter housing assembly from said filter base.
 27. The combination according to claim 26 wherein said spring housing resilient tongue is received within said connector housing midportion slot by snap fit to connect said spring housing to said connector housing.
 28. A method for attaching a filter housing assembly to a filter base, said filter base including a base platform having fluid ingress and egress stanchions oriented for receiving axially-extending fluid ingress and egress ports of said filter housing assembly, said fluid ingress and egress stanchions located on opposite sides of a formed enclosure disposed therebetween having longitudinal sides and lateral sides, said formed enclosure comprising a locking member in sliding communication with said base platform, said formed enclosure having a length extending in a direction perpendicular to said lateral sides, said fluid ingress and egress stanchions offset from a midpoint of said length in the direction of an end of said formed enclosure, and a wire harness assembly for establishing an electrical connection between said filter base and said filter housing assembly, said wire harness assembly including a first connector, a second connector, conductors extending between said first and second connectors, and one or more contacts provided on said second connector and being flexible from a first position to a second position when curved contact sections of said one or more contacts engage a mating connection surface of the filter housing assembly, and further including a connector housing integral with or connected to said base platform, said connector housing being partially disposed within laterally-extending slotted portions of said base platform, said laterally extending portions extending outwardly from said formed enclosure longitudinal sides, said connector housing having an upper surface and an oppositely facing lower surface and dimensioned to receive a first end portion of the one or more contacts, the method comprising: inserting ingress and egress ports of said filter housing assembly into said ingress and egress stanchions of said filter base to generate a resilient extraction force in an axial insertion direction; inserting a filter key of said filter housing assembly into said locking member of said filter base; while inserting, engaging the mating connection surface of said filter housing assembly with said one or more contacts curved contact sections to establish an electrical connection between said filter base and said filter housing assembly, such that said wire harness assembly one or more contacts flex from a first position to a second position and maintain engagement with said mating connection surface during said flexing; and releasing said filter housing assembly so that said resilient extraction force acts on said filter key in an axial extraction direction to mate said filter key with said locking member, such that extraction of said filter housing assembly is prohibited.
 29. A refrigerator comprising a filter base configured to receive a complementary mating filter housing assembly wherein said filter base comprises: a base platform having fluid ingress and egress stanchions oriented for receiving axially-extending fluid ingress and egress ports of said complementary mating filter housing assembly, said fluid ingress and egress stanchions located on opposite sides of a formed enclosure disposed therebetween for receiving a locking member and having longitudinal sides and lateral sides, said formed enclosure having a length extending in a direction perpendicular to said lateral sides, said fluid ingress and egress stanchions offset from a midpoint of said length in the direction of an end of said formed enclosure; and a wire harness assembly for establishing an electrical connection between said filter base and said complementary mating filter housing assembly, said wire harness assembly including: a first connector; a second connector; conductors extending between said first and second connectors; one or more contacts provided on said second connector, said one or more contacts being flexible from a first position to a second position when a mating portion of said one or more contacts engages a mating connection surface of said complementary mating filter housing assembly; and a connector housing integral with or connected to said base platform, said connector housing being partially disposed within laterally-extending slotted portions of said base platform, said laterally-extending portions extending outwardly from said formed enclosure longitudinal sides, said connector housing having an upper surface and an oppositely facing lower surface and dimensioned to receive a first end portion of the one or more contacts; and wherein said complementary mating filter housing assembly includes a housing having a substantially cylindrical body and a top portion for forming a fluid-tight seal with the body, the housing top portion having an axial center and further including: an ingress port and egress port extending from the housing top portion, each of said ingress port and egress port having a body with a top segment, a middle segment, and a bottom segment adjacent to the housing top segment and in fluid communication with said cylindrical body, the ingress port and egress port top segments having at least one seal at the junction with said middle segments, and the ingress port and egress port bottom segments having at least one seal at the junction with said middle segments, each of said seals having an outer surface first diameter, and the ingress port and egress port middle segments having an outer surface with a diametric extension less than the ingress port and egress port respective seal first diameters, such that the ingress port middle segment and egress port middle segment are formed in an hourglass shape; a filter key located on or connected to the housing for mating attachment to said filter base, the filter key comprising an extended finger including on one side a contacting portion forming a first angle in a first direction with respect to the housing top portion and an adjacent side forming a second angle in the first direction with respect to the housing top portion, such that the first angle and the second angle are not equal; and an electronic circuit component housing disposed adjacent to the filter key and having a recess for receiving an electronic circuit component therein, and for further connecting said electronic circuit component to the housing top portion, said electronic circuit component housing located on or connected to the filter cartridge assembly housing.
 30. The filter base of claim 1 wherein said formed enclosure includes a locking member in sliding communication with said base platform, said locking member acted upon by said complementary mating filter housing assembly during insertion or extraction of said filter housing assembly from said filter base. 